i flipped the switch and made the placemark codebase open source today: https://macwright.com/2024/01/19/placemark-oss

it's been cleaned up a bit, and some of the external dependencies are now optional, but it'd benefit massively if folks start improving it and tinkering with the internals. open sourcing big applications like this is a big roll of the dice: i think it's valuable in part because it's a complete, production application, but it is also a lot ot absorb all at once. time will tell!