Description: Cockatrice is an open-source, multiplatform program for playing tabletop card games over a network. It allows users to play games such as Magic: The Gathering online with other people.
Type: software
Pricing: Open Source
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