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.
Zeplin - Collaboration app for UI designers & frontend developers
MyChat - Secure instant messenger for any network
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
BORGChat - BORGChat is a LAN messaging software program.
Abstract - A secure, version-controlled hub for your design files