With Owlbear Rodeo 2.0 getting officially released the developers haven’t quite made made good on their promises to open source the original Owlbear Rodeo (releasing under a non-commercial license instead of a proper Open Source license what they are now calling “Owlbear Rodeo Legacy”), but the source is available on GitHub, complete with a docker-compose file to spin up your own instance.
+1 for that. The note about licensing in the repository doesn’t make clear the legal status of any modifications done to the software, even if for personal use; I wouldn’t risk building upon it if the company has legal channels to then claim any additional work done as their own.