Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
Vencord - The cutest Discord client mod
Ripcord - A desktop chat client for Discord and Slack
BetterDiscord - BetterDiscord enhances Discord with several features. Requires Discord To be installed!
Ziggs - Smoothly Share Content Between Devices!
WebCord - A Discord and Fosscord :electron:-based client implemented without Discord API.