Hacker News is a social news website focusing on computer science and entrepreneurship. It is run by Paul Graham's investment fund and startup incubator, Y Combinator. In general, content that can be submitted is defined as "anything that gratifies one's intellectual curiosity.

Code Project is a community for computer programmers with articles on different topics and programming languages such as web development, software development, C++, Java, and other topics.

Founded in 2008, Stack Overflow’s public platform is used by nearly everyone who codes to learn, share their knowledge, collaborate, and build their careers. Our products and tools help developers and technologists in life and at work. These products include Stack Overflow for Teams, Stack Overflow Advertising, and Stack Overflow for Talent and Jobs. Stack Overflow for Teams, our core SaaS collaboration product, is helping thousands of companies around the world as the transition to remote work, address business continuity challenges, and undergo digital transformation. Whether it’s on Stack Overflow or within Stack Overflow for Teams, community is at the center of all that we do.

Treehouse is a platform with online courses for people of all skill levels and backgrounds. They also have an online forum-based community where you can ask questions about programming topics.

A community for Developers and IT Professionals. Covering topics such as: Software Development, Web Development, Database Development + Optimization, Database Administration, System Administration, Network Administration and much more