Default Online tools to replace some productivity tools

Just sharing some online services which will help avoiding installation of extra apks to our device

online torrent client >
we can paste a torrent link in the input box and pressing go button will give the links to the included files !!
yes we can upload torrent files to the website and download the included files.

Unzip a zip or rar file

(use uc browser or uc mini with udisk support to avoid data usage on zip file upload)

Offline calculator from Microsoft