Stack Overflow

stack overflow, part of stack exchange , is a free, community-driven, reputation-based q & a site for computer programmers.

Free Android iPhone Web

Scoold

Scoold is inspired by StackOverflow and implements most of its features. You can ask and answer questions, upvote and downvote posts, earn badges and reputation.

Free Open Source Web Self-Hosted

Evi

Evi is a new digital assistant who is here to help with your everyday needs. Need to know where the nearest place to buy milk? She can help. Going out for dinner, but can’t decide where? She can help with that too.

Free Personal Android iPhone Web

AllAnswered

AllAnswered.com is a free hosted service for any community to build their own Stack Overflow-like Q&A board. Check it out to see how easy it is to have your own Stack Overflow.

Free Mac OS X Windows Linux Android iPhone Android Tablet Chrome OS Web