Etoys - Etoys is an educational tool for teaching children powerful ideas in compelling ways.
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
GCompris - Educational Game for Children 2 to 10 years old.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
childsplay - Childsplay is a collection of educational activities for young children and runs on Windows, OSX, and Linux. Childsplay can be used at home, kindergartens and pre-schools.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy