Onionshare - OnionShare lets you securely and anonymously share a file of any size with someone.
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
ShareDrop - HTML5 clone of Apple's AirDrop - easy P2P file transfer powered by WebRTC
MyChat - Secure instant messenger for any network
Send Anywhere - Send whatever you want, wherever you want
BORGChat - BORGChat is a LAN messaging software program.