Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Tynker - Game Worlds for Kids to Learn Programming
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
CodeCombat - Learn programming with a multiplayer live coding strategy game.
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.
StackHive - Design, develop or publish websites right from your browser