This mod gives you an Discord RichPresence.

The versions for 1.12, 1.16 and 1.19+ of this mod require Erdbeerbaer's GUI Library

Versions for 1.14 and 1.15 do not require any library

Features:

• Rich presence while game is starting
• Game/Modpack name (Configurable in the config)
• Rich Presence for Singleplayer with Worldname(can be changed in the config)
• Rich Presence for Multiplayer
  • Shows current IP, online players and maximum players (maximum players are different when the server uses Bungeecord or you are using direct join)
  • Supports Custom messages
  • Supports serverside custom messages
  • Hypixel support without extra plugins (in 1.3.0+ also including output of the current game's states)

Official list of servers using this mod:

TheHistoriaCraft

For modpack creators: You can set custom icons and an custom name for the game. See HERE