Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
CodeShare.io - Realtime code sharing for developers
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Code.gov - Share & reuse open source code from the Federal Government
Texmaker - Texmaker, free cross-platform latex editor
Code2Flow - An easy solution to create product flows.