I use
farmOS to keep track of a moderately large rabbitry ~70 rabbits. farmOS doesn't have any rabbit-specific functionality out of the box, but it does have a rock-solid data model for keeping track of animal locations, weights, and various other data - photos, logs, etc.
On top of that I have written a prototype tool I call "Rabbit Link" which is linked to by a QR code on each rabbit cage. The tool helps automate some of the routine data management and works offline as a
PWA. The tool wouldn't be trivial to share at this point, but I'm eventually hoping to release it as a contrib module for farmOS and would be happy to collaborate if that's of interest.