Trillian - Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.
WATI - No-code chatbot builder for WhatsApp Business
LimeChat - LimeChat is an IRC client for Windows, Mac OS X and iOS. Features
Interakt - Easily interact with every user of your app. Setup Your User Interaction Headquarter Today!
Adium - Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
AiSensy - Whatsapp Chatbot, CRM & Marketing