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NuggetBot can notify you whenever a youtube or twitch streamer goes online, this will make sure all of your friends can watch the stream on time.
Mirai has a set of commands to get information on Twitch channels. She can also be setup to notify a channel when a streamer goes live or updates their stream info.
Trident can play live streams, thru the play command.
A simple to operate musical streaming bot!
YouTube can alert you when a YouTuber goes live.