Moin first.
Do you know good stream alerts for streaming that are also free?
I stream on Twitch almost every day and play Rocket League. If you know any can you please tell us?
You are also welcome to join my stream so that I can finally manage the 3.0 viewers on average twitch.tv/mikachu4414
Personally, I like the ones from TipeeeStream very much and they are also reliable.
Especially if you update these (or preferably all) browser sources at the beginning of each stream.
For the images on TipeeeStream for the alerts you go to "gify" and there you have a pretty large selection of pretty good GIFS I think.
The music or the sound can be uploaded there yourself. So theoretically it can be EVERYTHING.