Documents by Readdle - A central hub for all your files.
LinkedIn Learning - Online training through LinkedIn's professional network.
Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
FE File Explorer - The one-stop files solution
Fluany - Everything you need to force your mind to learn