wikipedia:Comparison of cross-platform instant messaging clients
IM, Messenger, Slack, Mattermost, RocketChat, Gitter, Discord, Microsoft Teams, Skype, Amazon Chime, Zoom, Google Chat, AWS Chatbot, LiveChat, APNs, Arattai, Zulip, Chanty, Fleep, Spaces, Zoho Connect, QQ, WhatsApp, Cliq, iMessage
