Python

• http://www.webputty.net/ https://github.com/FogCreek/WebPutty/
• https://www.getsentry.com https://github.com/getsentry/sentry
• http://www.newsblur.com/ https://github.com/samuelclay/NewsBlur

Node.js & JavaScript

• http://livereload.com/ https://github.com/livereload/LiveReload2
• http://vintagejs.com/ https://github.com/rendro/vintageJS
• https://github.com/SachaG/Telescope
• https://github.com/systemed/iD

Mobile

• https://anypic.org/ https://github.com/ParsePlatform/Anypic
• https://openphoto.me/ https://github.com/photo

Ruby

• https://github.com/errbit/errbit

Java

• http://graylog2.org/