LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Easy Context Menu - Easy Context menu is a Freeware portable utility that includes useful tweaks for the context menus.
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.
Shell context menu manager - Powerful and lightweight context menu manager for Windows File Explorer.
MyChat - Secure instant messenger for any network
FileMenu Tools - FileMenu Tools lets you customize the context (right-click) menu of Windows Explorer.