Fredboat - FredBoat is one of the best online music bots for Discord.
MEE6 - MEE6 is a multipurpose Discord bot with moderation capabilities, leveling, Twitch alerts, and an easy-to-use online dashboard.
24/7 Discord Bot - 24/7 is a discord bot that lets you play songs on-demand or listen to a radio station all day long without ever having to stop.
YAGPDB - YAGPDB (Yet Another General Purpose Discord Bot) is an advanced configurable Discord bot providing a load of features for help with managing a server.
Groovy - A dynamic language for the Java platform
Yui Bot - Yui Bot is a simple discord bot that offers you the fun features to manage the discord servers and provides you the various commands to control severe activities such as moderation, automation, permission, skills, etc.