MobileUO: https://github.com/voxelboy/mobileuo/

I ported Ultima Online to Android and iOS devices. It's a really old MMO at this point but still has a niche following. New community shards are still popping up and some of them (such as UO Outlands) have high populations.

I opened up a Patreon for the project in hopes that the community and the shard owners would support me enough to keep working on it but I never got past 100 euros per month in pledges. The app does have a stable userbase of around 1000 users though.

Even though it wasn't a financial success by any measure, I'm really proud to have brought my childhood favourite game to new platforms.