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.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
MyChat - Secure instant messenger for any network
Android Sync for Windows - Android Sync Manager on PC, transfer, backup Android data, free download Android apps and games
BORGChat - BORGChat is a LAN messaging software program.
OpenMTP - OpenMTP is a free and open-source app to transfer files from an Android Phone to macOS.