覆盖在线学习、知识管理、团队协作与项目管理。
Visual, interactive tutoring in math and coding, from 5th grade through college. Master concepts in algebra, calculus, Python, computer science, and more.
Find the online learning path for you, delivered by world-class institutions like Harvard, Google, Amazon, and more.
Join millions of people learning on FutureLearn. Find online courses and degrees from leading universities or organisations and start learning online today.
MIT OpenCourseWare is a web based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity
Study hundreds of free short courses, discover thousands of articles, activities, and videos, and earn digital badges and certificates.
Learn online and advance your career with courses in programming, data science, artificial intelligence, digital marketing, and more. Gain in-demand technical skills. Join today!
Unlock thousands of streaming video lectures from the world's greatest professors. Explore subjects from history and science to photography and cooking with The Great Courses Plus. Start your free trial and satisfy your curiosity today.
全历史(Allhistory）以AI知识图谱为核心引擎，通过高度时空化、关联化数据的方式构造及展现数字人文内容，尤其是历史知识。让用户沉浸在纵横开阔、左图右史的（历史、人文、社科等）知识海洋中。
开放预印本平台，适合跟进快速发展的研究方向。
中国知网知识发现网络平台—面向海内外读者提供中国学术文献、外文文献、学位论文、报纸、会议、年鉴、工具书等各类资源统一检索、统一导航、在线阅读和下载服务。涵盖基础科学、文史哲、工程科技、社会科学、农业、经济与管理科学、医药卫生、信息科技等十大领域。
Connected Papers is a visual tool to help researchers and applied scientists find academic papers relevant to their field of work.
The world’s largest collection of open access research papers
开放获取期刊目录，适合筛选可自由阅读的学术期刊。
借助 Google 学术搜索，您可以轻松地大范围搜索学术文献。搜索范围囊括众多知识领域和来源：文章、论文、图书、摘要和法院判决意见书。
为贯彻落实习近平总书记在哲学社会科学工作座谈会上的讲话精神，中国社会科学院牵头建设国家哲学社会科学文献中心。中心立足全国哲学社会科学领域，由国家投入和支持，开展哲学社会科学文献信息资源建设和服务。中心目前收录的文献类型包括中文期刊、外文期刊、集刊、古籍，并建设了优先发布栏目、习近平新时代中国特色社会主义思想专栏等。
开放的学术知识图谱，适合分析论文、作者和机构关系。
PubMed® comprises more than 40 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
Save hours on your literature review. Use ResearchRabbit to find related papers, build citation maps, and track research trends — powered by AI.
Semantic Scholar uses groundbreaking AI and engineering to understand the semantics of scientific literature to help Scholars discover relevant research.
有品格的数字图书馆, 书格, 每个人都能自由地看到我们的文明
万方数据知识服务平台与全球国内外30余家大型数据库集成商、出版商、公益机构达成战略合作，整合数亿条全球优质学术资源，集成期刊、学位、会议、专利、科技报告、成果、标准、法规、地方志、视频等十余种学术资源类型。平台基于先进的人工智能技术，打造涵盖资源发现、学术不端检测、学术分析、学科选题以及知识管理等领域的智能化平台与工具，为用户提供海量资源的统一检索发现和获取、学术科研的全流程服务，帮助用户精准的发现知识、便捷的获取知识、更愉悦的创造知识。
Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
欧洲专利局的全球专利检索入口，适合查找专利家族。
ETSI provides an open, collaborative environment to develop globally applicable standards for ICT-enabled systems, applications, and services.
Search and read the full text of patents from around the world with Google Patents, and find prior art in our index of non-patent literature.
国际电工委员会标准资源，适合电气与电子领域查询。
The official home of RFCs. RFCs outline computer networking and Internet foundations, including Internet Standards and historical or informative content.
国际标准化组织的标准与技术委员会信息入口。
NIST promotes U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life.
国家市场监管总局建立的官方权威入口，免费查阅 GB 与 GB/T 国家标准。
This page introduces web standards at a high-level.
The home of the U.S. Government's open data
专注同行评审研究数据存档，适合查找可复用数据。
支持研究数据、图表和资料的公开共享与引用。
Explore datasets powering machine learning.
iNaturalist 是一个专为博物学家的社交网路！记录您对动植物的观察，与您的朋友和研究人员分享他们，并了解有关自然世界的那些事吧。
OpenML is an open platform for sharing datasets, algorithms, and experiments - to learn how to learn better, together.
Research and data to make progress against the world’s largest problems.
地球与环境科学数据发布平台，适合查找长期观测资料。
World Bank Open Data from The World Bank: Data
为研究数据和软件提供长期存档与引用标识。
公开美国法律与法规资料，适合进行法律文本检索。
欧盟法律和官方文件数据库，适合查询欧盟法规。
全国人大维护的法律法规数据库，适合查询现行规范文本。
汇集国务院政策文件和行政法规信息。
Create and download personalized legal documents online in minutes with LawDepot's easy-to-use questionnaires. Save your time and money; use LawDepot today.
Get expert legal services in France with LegalZoom. From business formation to legal documents, we make law simple and accessible. Start today!
Rocket Lawyer makes the law affordable and simple. Create and sign legal documents online, get legal advice from attorneys, incorporate your business, and more!
查询公开裁判文书，适合进行案例资料检索。
Westlaw is the industry leader for legal research platforms and tools, including Westlaw Precision, Westlaw Edge, Westlaw Classic, and more.
The most popular dictionary and thesaurus for learners of English. Meanings and definitions of words with pronunciations and translations.
Crowdin is an all-in-one localization and translation management platform with all the software, tools and integrations you need to localize your content.
The online etymology dictionary (etymonline) is the internet's go-to source for quick and reliable accounts of the origin and history of English words, phrases, and idioms.
Streamline global translation with AI. Connect systems, reduce costs, and secure multilingual content with enterprise-grade workflows.
English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese
权威英语词典，适合查询词义、用法和例句。
Phrase is the AI-powered language intelligence platform for enterprise. Automate workflows, connect any tool or engine, and scale multilingual content globally.
A Chinese language reference and learning app for iPhone, iPad, and Android
结合具体情境翻译单词、成语， 一部具有无数条英语, 法语, 西班牙语, 意大利语, 俄语, 德语, 阿拉伯语和葡萄牙语例句的免费词典
Smartcat is your all-in-one AI translation platform with industry-leading AI translation, AI localization, AI content generation, and AI-human workflows.
开放多语种词典，适合查词源、变形和跨语言解释。
结合双语词典和用法论坛，适合核对翻译细节。
网易有道是中国领先的智能学习公司，致力于提供100%以用户为导向的学习产品和服务。有道成立于2006年，打造了一系列深受用户喜欢的口碑型大众学习工具产品，例如：网易有道词典、有道精品课、有道翻译官、有道云笔记等。2014年，网易有道宣布正式进军互联网教育行业。2018年4月，网易有道完成首次战略融资，投后估值11.2亿美金，跻身独角兽阵营。2019年10月，网易有道成功登陆纽交所，股票代码为“DAO”，成为网易集团首个独立上市的公司。
汉典 | 汉语字典, 汉语词典, 康熙字典, 说文解字, 音韵方言, 字源字形, 异体字
通过间隔重复卡片长期记忆词汇和知识点。
Study a new language online with Busuu's award-winning courses. Learn together with native speakers in Busuu's community.
Clozemaster is language learning gamification through mass exposure to vocabulary in context. Great post-Duolingo app and useful for language learners of all levels. Free to sign up and play!
多邻国是世界上最受欢迎的语言学习平台。免费、有趣、科学。现在就登录 duolingo.com 或手机应用开始学习吧！
收录母语者词汇发音，适合核对真实读音。
Join 70M+ language learners worldwide. Practice 260+ languages through text, voice, and video. Make language learning easier through real language exchange.
用音频课程讲解语言结构，适合理解式学习。
Learn languages naturally from podcasts, books and TV shows with the LingQ app. Grow your vocabulary from real content and track your progress in a global community.
Memrise is a language learning app for people who have a specific reason to learn. Trusted by 80 million learners, Memrise offers specialised courses for your goals: passing an exam, speaking confidently at work, building relationships or for discovering cultures you love. Unlike gamified apps with robotic voices, it's built around real native-speaker videos - so you learn to speak like real people.
围绕商学院考试提供题库、经验与学习讨论。
HackerRank is the market-leading coding test and interview solution for hiring developers. Start hiring at the pace of innovation!
IELTS Preparation with Liz: Free IELTS Tips and Lessons, 2026
Kaplan Test Prep offers test preparation, practice tests, and private tutoring for 90+ standardized tests, including MCAT, LSAT, GMAT, GRE, SAT & NCLEX.
以算法题训练技术面试能力和代码思维。
Magoosh offers self-paced online test prep and free resources that's accessible, enjoyable, and effective
The Princeton Review offers online test preparation for SAT, ACT and graduate school entrance exams. Enroll in our test prep courses today.
Der TestDaF ist die wichtigste deutsche Sprachprüfung für internationale Studienbewerber*innen auf Ihrem Weg an eine deutsche Hochschule.
Beat the TOEFL® Do you want to improve your score on the 2026 TOEFL Test? We can help.
提供可交互的 K12 科学与数学教材。
通过课程和练习支持 K12 与基础大学教育。
Engage with National Geographic Explorers and transform learning experiences through live events, free maps, videos, interactives, and other resources.
OER Commons is a dynamic digital library and network. Explore open education resources and join our network of educators dedicated to curriculum improvement.
OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects!
Inspire your students with thousands of free teaching resources including videos, lesson plans, and games aligned to state and national standards.
以互动模拟帮助理解物理、化学与数学概念。
Build new skills or work towards a degree at your own pace with free Saylor University college courses.
Learn photography, design, video, business, and more from working creators. Join 10+ million students on CreativeLive and start creating today.
Domestika is the largest creative community. Learn and share from anywhere with online courses taught by the best professionals in the world of design and creativity.
HowStuffWorks has been explaining how things work to curious minds since 1998. Providing factual, unbiased content that's fun to read and makes difficult topics easy to understand.
iFixit 是一个以维修为主题的全球性互助社区。从一个一个的设备开始，让我们来一步一个脚印一点一点的修复这个世界。你可以在问题解答论坛和专家一起互动——还可以创建并与全世界分享由你编篡的维修手册。你可以在这里买到所有关于你的 DIY 维修计划的配件及工具，帮助修复好你的苹果或安卓设备。
Instructables is a community for people who like to make things. Come explore, share, and make your next project with us!
MasterClass offers online classes created for students of all skill levels. Our instructors are the best in the world.
以创意和职业技能课程为核心，适合项目式学习。
The Physics Classroom serves students, teachers and classrooms by providing classroom-ready resources that utilize an easy-to-understand language that makes learning interactive and multi-dimensional. Written by teachers for teachers and students, The Physics Classroom provides a wealth of resources that meets the varied needs of both students and teachers.
Learn how to do anything with wikiHow, the world's most popular how-to website. Easy, well-researched, and trustworthy instructions for everything you want to know.
AFFiNE is the open-source Notion & Miro alternative — combining docs, whiteboards, databases, and AI in one local-first workspace. Free for teams.
Create notes, tasks, databases, and chats that only you can access. Your data stays on your device — fully owned, secure, and private. Free to start.
AppFlowy is the AI collaborative workspace where you achieve more without losing control of your data
Capacities is a note-taking and knowledge management app that organizes your ideas as connected objects instead of files and folders. Available free on Mac, Windows, Linux, iOS, and Android.
一款免费的笔记与效率应用，在你所有设备上陪伴左右。更有高级功能可选。
End-to-end encrypted collaborative office suite
HedgeDoc (formerly known as CodiMD) is an open-source, web-based, self-hosted, collaborative markdown editor.
Karakeep is the open-source bookmark manager for links, notes, and images. Automatically organize and tag your bookmarks with AI. Self-hostable, with apps for iOS, Android, Chrome, and Firefox.
便捷安全的高效云端 Office 办公与团队表格协作平台，完美兼容 WPS 与 Word/Excel 格式。
A privacy-first, open-source platform for knowledge management and collaboration.
Memos is an open-source, self-hosted note-taking app — a Markdown-native timeline for quick notes, daily logs, links, and snippets. Self-host with Docker in minutes; private and free.
A modern, simple, and blazingly fast way to collaborate – bring knowledge, docs, and projects together in one place.
The free and flexible app for your private thoughts.
A modern team knowledge base for your internal documentation, product specs, support answers, meeting notes, onboarding, & more…
For your inspiration, read later, media and stuff
石墨文档-全新一代云Office办公软件,支持多人在线文档协同办公,实现多终端、跨地域、随时随地在线办公,涵盖在线文档、在线表格、应用表格等8大办公套件即写即存统一管理、高效共享是企业云协同办公系统与在线办公平台的更好选择。
Slite is the self-maintaining AI knowledge base that stays accurate. Verified by your team, synced with your tools, trusted by every agent.
Tana is an agentic meeting platform. Work gets done in the meeting, not after. Agents create documents, file issues, and update your context graph while you talk. And each meeting makes future meetings smarter.
优雅高效的在线文档编辑与协同工具，让每个企业轻松拥有文档中心，阿里巴巴集团内部使用多年，众多中小企业首选。主流 Office 文件全兼容，多人协同，轻松拥有团队知识库。企业文档中心化管理，各类文档井然有序，独立域名，随时随地安全获取。语雀致力于帮助每一个个体与企业，都拥有珍贵的知识财富。写文档，就用语雀！
Work management software for teams and AI agents. Plan, automate, and execute critical workflows together.
A fully customizable scheduling software for individuals, businesses taking calls and developers building scheduling platforms where users meet users.
Our mission is to make the world more productive. To do this, we built the everything app for work - Tasks, Docs, Goals, and Chat.
Project management for teams and AI agents. Plan, track, and ship with Projects, Wiki, and AI. Available on cloud, self-hosted, and air-gapped.
PLANKA is a self-hosted Kanban board for agile project management. Real-time collaboration, unlimited users, GDPR compliant. Free Community edition under a Fair Use License.
The digital daily planner that helps you feel calm and stay focused.
Toggl 2.0 combines trusted time tracking with project planning — so every deadline is grounded in reality, not guesswork.
Vikunja is open-source task management you can self-host. Lists, Kanban, Gantt, and more — on your server or ours. Made and hosted in the EU.
专注看板工作流，适合团队和个人进行高效协作。
Gather is a virtual workspace that feels refreshingly human. Meet, chat, and interact like your remote team is in person.
Join a WebRTC video conference powered by the Jitsi Videobridge
Accelerate your mission critical workflow by integrating people, processes, tools and AI infrastructure on a resilient and adaptable platform.
Centralize real-time messaging, voice, video, AI, and apps for secure, reliable and unified communication among internal and external stakeholders.
See how much more efficient your teamwork can be (even across time zones). Named a World Changing Idea by Fast Company.
Host quick instant meetings or embed video calls into your platform with Whereby’s video conferencing API and SDK.
Zulip is an organized team chat app for distributed teams of all sizes.
Create powerful forms, surveys and quizzes your audience will answer. Store responses directly where you need them.
Formbricks is an open-source experience management platform for surveys, in-app feedback, and customer insights. Own your data with full privacy.
Create surveys, quizzes, and polls with HeyForm's free form builder. Sign up now to craft beautiful, interactive online forms easily and quickly for FREE.
Create forms and surveys easily with Jotform's drag-and-drop form builder. Start collecting registrations, applications, orders, and payments for free.
创建调查 ➤ LimeSurvey: 专业调查工具 ✦ 800+ 模板 ✦ 28+ 问题类型 ✦ 个性化设计 ➜ 立即免费开始调查！
Create forms and surveys, take payments, automate workflows and send documents for signing, all from one easy, doc‑style form builder FOR FREE
The simplest way to create beautiful, professional forms in seconds. Unlimited forms, unlimited submissions, forever free. Just start typing - no coding needed.
Build AI-powered forms that get 3.5x more data — then trigger automated workflows to enrich leads, follow up, and grow revenue. No code. Start free.
Boardmix博思白板是一款AI在线团队协作工具，支持无限画布、多人实时编辑、思维导图、流程图、会议共创、项目规划和模板复用，个人可免费开始使用。
Free, open source diagramming application with 100M+ users. Store your data wherever you want—we can't access it.
A visual collaborative whiteboard where teams can diagram, brainstorm, and organize ideas together.
Heptabase is an intelligent, visual knowledge base built for students, researchers, and lifelong learners.
Create next-generation diagrams with AI, data, and automation in Lucidchart. Understand and optimize every system and process.
Simplify documentation and avoid heavy tools. Open source Visio Alternative. Commonly used for explaining your code! Mermaid is a simple markdown-like script language for generating charts from text via javascript.
The free online mind map maker trusted by 40M+ people. Create, share, and generate AI mind maps in seconds. No download. Start free.
Speed up product development from ideation to launch. Align teams, break tool silos and ship what customers need in one AI-powered visual platform.
幕布是一款大纲笔记和思维导图结合的笔记工具，通过树形结构来更清晰更高效的记录笔记，还可绘制思维导图、逻辑图、组织结构图、时间轴、树形图等多种图形。在记录学习笔记、备考资料、管理任务、制定计划清单时，还可实现团队间的实时协作和共享，提升团队工作效率。
ProcessOn是一款专业在线作图工具和知识分享社区，支持AI一键生成思维导图和流程图。可绘制甘特图、ER图、UML、网络拓扑图、电路图、平面图、鱼骨图、组织结构图、时间轴等多种图形，同时可实现人与人之间的实时协作和共享，提升团队工作效率。
A free and instant virtual whiteboarding with online collaboration. No signup required. Works on all devices: mobile, tablets, and desktop.
Design and document implementation with diagrams. Shape UI with wireframes. Collaborate with your team and AI.
Create mind maps online or on desktop with Xmind. Brainstorm ideas, organize thoughts, use AI, templates, and visual structures to plan projects clearly.
Genially is the all-in-one tool for creating interactive and animated content. Design presentations, infographics, quizzes, escape rooms, and much more — no code needed.
Create presentations that inspire. Use Haiku Deck to build your next presentation 10x faster and more beautiful than other presentation tools. Sign up for free.
Pitch is the collaborative presentation platform for teams that want to create, share, and deliver better work.
Prezi is a presentation platform for educators, trainers, and teams. Build a presentation with AI, engage your audience live with polls and quizzes, then share one link people can revisit and respond to after the session ends.
基于 Markdown 快速生成 PPT 演示文稿的轻量化在线排版与设计工具。
We've helped startup founders raise over $500M in venture capital. Sign Up for our AI pitch deck creator, or book a call with our pitch deck design agency to enlist our team's help crafting your company pitch.
Create, share, and present exceptional decks with a faster browser-based workflow.
Create professional presentations, interactive infographics, beautiful design and engaging videos, all in one place. Start using Visme today.
Zoho Show is a free online presentation software that lets you create, collaborate, publish, and broadcast presentations from any device, quick and easy.
BambooHR makes it easy to simplify HR, with award-winning solutions for everything from hire to retire. Learn more with a free demo today.
Discover Baserow, the open-source no-code platform for building databases and applications. No code or technical skills needed. Start creating for free today!
Close is the CRM with a built-in AI teammate that works with your team to call leads, qualify prospects, book meetings, and keep your CRM up to date automatically, so you can focus on selling.
Sign everywhere with Documenso. Build workflows, create templates, and integrate seamlessly with tools you love—modern, secure, and customizable for any scale.
ERPNext is the world's best 100% open source ERP software which supports manufacturing, distribution, retail, trading, services, education & more. Contact us!
提供客服、销售和员工服务工具，适合业务团队协作。
Grist is a relational spreadsheet-database that empowers you to organize your data, your way. Get started with a free trial.
整合薪酬、福利和人力流程，适合美国中小企业。
HubSpot's customer platform includes all the marketing, sales, customer service, and CRM software you need to grow your business.
开源企业套件，涵盖销售、库存、财务和生产。
Pipedrive 是款操作簡單且使用者評分第一的 CRM 工具。用我們的銷售 CRM 找出更多合格的潛在客戶，讓生意蓬勃發展吧。現在立即註冊，享受 14 天免費試用。
Rippling eliminates the friction from running a business, combining HR, IT, and Finance apps on a unified data platform.
Make smarter decisions, empower your employees, and enhance your business operations with a unified software platform comprising 50+ apps. Boost productivity.
由全球顶尖大学与机构提供的在线精品认证课程平台
专为研发团队打造的高速项目管理与看板系统
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