In maintaining KameSame, I’ve got several features I’d like to build that depend on reliable & correct conjuguations of Japanese words (verbs for now, eventually い-adjectives, too)
For now this is just printing some handful of forms on the item page, but eventually I’ll be trying things like generating cards based on random conjugations (e.g. “Let’s cook”, “To be able to swim”)
In any case, I’ve open-sourced a gem named Katsuyou (活用) to do this for me. Feel free to poke around or consider using it in your apps—feedback welcome!