Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Decidr - Make better decisions with quick A/B polls
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Acquainted - A simple tool to create conversational polls and surveys
Texmaker - Texmaker, free cross-platform latex editor
tbh - The only anonymous app with positive vibes