Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
The Most Dangerous Writing App - If you stop typing, all progress is lost.
Fidus Writer - Fidus Writer is an online collaborative LaTeX editor especially made for academics who need to use...
Samsung Notes - Samsung Notes app enables users to create text files and notes by adding multimedia files such as images, audio voice recordings, videos, and various other stuff.
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Copy History Support - Copy History Support is an app by JetToast Apps that allow users to access copied data on the clipboard to share it with other users, and they can view the complete history of data on the clipboard.