I launched mergecaravan.com to deal with a problem I've encountered at a few jobs in the past. Mostly, I built it initially to scratch my own itch, and to go back to doing more django dev.

Basically, you can add a label to a PR in github and it will then queue it up to be merged once all the required checks pass, and it keeps queued PRs "up-to-date".

It's made a little money, but not much.

Github recently rolled out a feature at Github Universe that has overlap, so I'm guessing it won't get much more traction.

A few lessons I learned: - Especially when building on a platform, make sure you have the right niche. In this case, it probably has a wide enough audience that Github decided it was worth it to build as part of the platform. - Like any engineer, I spent too long building and let scope creep delay me from launching.

All in all, it's pretty cheap (read: basically free) to run, but I probably committed somewhere over 120 hours on it.