Education

1. Khan Academy - Free online courses covering a wide range of subjects for all ages.
2. Coursera - Offers online courses from top universities and organizations worldwide.
3. edX - Provides access to free online courses from leading universities.
4. Duolingo - A fun and engaging platform for learning new languages.
5. Quizlet - A study tool that uses flashcards and games to help learn various subjects.

Research and Reference

1. Google Scholar - A freely accessible search engine for scholarly articles and research papers.
2. PubMed - A resource for research articles in life sciences and biomedical topics.
3. JSTOR - A digital library of academic journals, books, and primary sources.
4. Internet Archive - A non-profit digital library offering free access to books, movies, music, and more.
5. Project Gutenberg - A collection of over 60,000 free eBooks, including classic literature.

Technology and Coding

1. Codecademy - Interactive coding lessons for beginners in various programming languages.
2. FreeCodeCamp - Offers free coding lessons and projects for building web applications.
3. W3Schools - Comprehensive web development tutorials and references.
4. GitHub - A platform for version control and collaboration on coding projects.
5. Stack Overflow - A community-driven Q&A site for programming and software development questions.

Personal Development

1. TED - Inspiring talks from experts on a wide range of topics, available for free.
2. MindTools - Resources for personal and professional development, including articles and tools.
3. Skillshare - An online learning community with thousands of classes on creative skills.
4. Coursera for Business - Offers professional development courses tailored for teams.
5. FutureLearn - Free online courses from universities and organizations.

Finance and Business

1. Investopedia - A comprehensive resource for financial education and investing information.
2. NerdWallet - Personal finance advice, reviews of financial products, and budgeting tools.
3. HBR (Harvard Business Review) - Articles and resources on business and management topics.
4. LinkedIn Learning - Online courses for business, technology, and creative skills.

Health and Wellness

1. WebMD - A source for health information, symptom checkers, and expert advice.
2. Healthline - Articles on health, nutrition, and fitness, with a focus on evidence-based information.
3. Mayo Clinic - Trusted medical information and resources for various health conditions.
4. Calm - An app and website for meditation, relaxation, and sleep resources.
5. MyFitnessPal - A tool for tracking diet and exercise, with a community for support.

Environment and Sustainability

1. World Wildlife Fund (WWF) - Information on conservation efforts and environmental education.
2. NASA Climate - Resources and data related to climate change and space science.
3. EcoWatch - News and resources on environmental issues and sustainable living.
4. TreeHugger - Articles on sustainable living, green technology, and environmental news.
5. National Geographic - Articles and documentaries on nature, science, and cultures.

Creativity and Hobbies

1. Pinterest - A visual discovery tool for finding and saving creative ideas across various topics.
2. Behance - A platform for showcasing and discovering creative work across multiple disciplines.
3. Canva - An easy-to-use graphic design tool for creating visuals and presentations.
4. Instructables - A community for sharing DIY projects and tutorials.
5. Ravelry - A social network for knitters and crocheters to share patterns and projects.

News and Information

1. BBC News - Comprehensive news coverage from around the world.
2. Reuters - Reliable news source for business, politics, and international events.
3. NPR - News and stories covering a wide range of topics, including culture and science.
4. Al Jazeera - In-depth news coverage and analysis from a global perspective.
5. The Guardian - Articles and news on current events, culture, and more.

Miscellaneous

1. HowStuffWorks - Explains how things work, covering various topics in an engaging way.
2. Lifehacker - Tips and tricks for improving productivity and everyday life.
3. TED-Ed - Animated educational videos that make learning fun and engaging.
4. Medium - A platform for articles and stories from writers on diverse topics.
5. Quora - A question-and-answer platform where users share knowledge and expertise.