Less useful since Geometry Nodes were included, but generative/procedural stuff was only possible via the API for a long time. Besides that, every single addon

Less useful since Geometry Nodes were included, but generative/procedural stuff was only possible via the API for a long time. Besides that, every single addon is leveraging the Python API, so basically any functionality you get from installing an addon. Besides that, I've written bunch of macros as basically python files I execute in Blender to do repetitive tasks. Another thing I've done is writing a distributed render queue for headless rendering, using the Python API.