Description: Stack Overflow is a popular question and answer site for programmers. Users can ask coding questions and receive answers from a community of developers. The site has a reputation system to rate helpful responses.
Type: software
Pricing: Subscription
Description: Xabber is an open-source chat client for Windows, Linux, MacOS, Android, and iOS that allows users to connect to multiple chat networks and services like Google Talk, Facebook, Jabber/XMPP, MSN, Yahoo and more from one application.
Type: software
Pricing: Open Source