LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Bashupload - Upload files from command line to share between servers
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.
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
MyChat - Secure instant messenger for any network
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.