Alternatives to Put.IO Adder

Server and cloud storage browser

Client for Proton Drive

Open-source BitTorrent client

Client for PikPak cloud storage service

Utility that automatically downloads firmwares and installers

Desktop client for Filen.io

Open-source Dropbox client

File syncing client

VPN and WiFi proxy

Client for the Box cloud storage service

Amazon Glacier file transfer client

File manager