Imoji - Turn selfies or any photo into stickers you can text
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
MailPort - Send your MailChimp newsletter to Facebook Messenger
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.
BotList Messenger Bot - Search and discover chatbots on Messenger with BotList
MyChat - Secure instant messenger for any network