SMTube
SMTube is a free and open source program for searching and watching YouTube videos
Xournal++
Xournal++ is a free and open source, cross-platform program for creating handwritten notes and annotations in PDF documents
VGrive
VGrive – free and open source Google Drive client with automatic synchronization for Linux
OnionShare
OnionShare is a free and open source, multi-platform program that allows you to securely and anonymously share files, host websites, and communicate with friends using the Tor network
MEGA
MEGA – free program for syncing and backing up data to cloud storage MEGA.nz
Dropbox
Dropbox – a free cross-platform client for storing files in the cloud
Yandex.Disk
Yandex.Disk – free and open source graphical utility that you can use to set up a connection to Yandex.Disk on Linux
draw.io
draw.io – free and open source, cross-platform program for creating diagrams and schemes , official desktop client diagrams.net
Tixati
Tixati – free torrent client with advanced torrent control for Linux and Windows
Transmission
Transmission – free and open source, cross-platform BitTorrent client