When Mixer.com was still around and introduced fan progression, basically just a system where viewers would gain experience points by watching and interacting with a stream, I created an overlay for streamers to showcase a viewer who leveled up.
Streamers could choose which levels a user needed to reach before an alert would fire and display on the stream, users to exclude (eg. chatbots) and also add a little notification sound. This was all made possible with a small website that would generate a special link with the options included in the URL which streamers would them put into their favorite streaming software.
The overlay ended up gaining a good amount of popularity among the streamers on Mixer, big and small, and turned into a project I was proud of.
Underneath here is a little promotional clip from my own stream with the alert going of