Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.

Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.

Documents by Readdle - A central hub for all your files.

TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...

FE File Explorer - The one-stop files solution

TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.