GIMP 3.0 is on the horizon, bringing new features and improvements. Excitingly, it will utilize GTK 3 and Python 3, making it easier to develop plugins. Existing Python 2 plugins will become obsolete, but the new Python 3 plugins will be more future-proof. Resources on writing GIMP 3 plugins are limited, so I’ve compiled some notes and sources to help. Plugins can be written in various languages, with a focus on Python 3. The embedded Python interpreter allows for easy plugin editing without restarting. Additional Python modules can be bundled with plugins. For assistance, check out the IRC channel #gimp-dev.
https://schoenitzer.de/blog/2025/Gimp%203.0%20Plugin%20Ressources.html