Way back in 2015 Tim Holman made Github Corners, which are now everywhere across the open-source community. They're an undeniable improvement over the prehistoric ribbons (from 2008!) and are a beacon for collaboration. But now I use GitLab!
So here's a "thank you" to GitLab for being great, which I'll be using from now on. If you haven't tried it out, I definitely recommend giving it a go. And go follow @twholman on twitter, he makes some great stuff.