
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
Send
LocalSend
Wormhole.app
Onionshare
WeTransfer
Send Anywhere
Syncthing
ShareDrop
kdiff3
SendBeyond Compare - Beyond Compare allows you to compare files and folders.
LocalSend - An open source cross-platform alternative to AirDrop
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Onionshare - OnionShare lets you securely and anonymously share a file of any size with someone.