The Ultimate Streamer Platform
StreamElements service uses the term Alert Box, and it works as an overlay widget inside their dashboard.
The stream alerts widget allows for a centralized place to tell viewers about new subscribers, followers, tips, hosts, and cheers.
The “Alert Box” includes sound alerts as well as visual alerts as an overlay on your stream.
Famous StreamElements users include PUBG streamer Shroud, at least for donations during his streams.