Making Konjugaattori 3000 (Conjugator 3000) and using it helped me to better understand and memorise the rules of Finnish verb conjugation. I hope that it will help others to learn Finnish verb conjugation too, so here it is.
For now, only present time is available. Don't worry, it will keep you busy for a while.
Here it is: https://martinbussyparis.itch.io/konjugaattori-3000