Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
Onionshare - OnionShare lets you securely and anonymously share a file of any size with someone.
MyChat - Secure instant messenger for any network
ShareDrop - HTML5 clone of Apple's AirDrop - easy P2P file transfer powered by WebRTC
BORGChat - BORGChat is a LAN messaging software program.
Send Anywhere - Send whatever you want, wherever you want