I’m something of an amateur dabbler. I’ve hand-printed one copy of a card game I still tweak every couple times I play it.
The game is “Imperial Intrigue: Regicide”, and it is based on the tarot deck–the face cards and major arcana are “Notables” who I’ve designed characters and rules for, and 1-10 in every suit are “Vassals” that you can play on the Notables to make them worth more power. The premise is that the Empress has just been assassinated and you control a faction of Notables trying to rise to control of the Empire, install your own candidate for the throne, and if possible pass the buck for having actually committed the assassination to your rival factions (ie, players).
I really don’t have an online version, and there are some deep structural issues I’ve identified that I’m playing around with to try to streamline, but it is a fun exploratory learning experience!
Then since I’d already created these characters and this world (already cribbing from an abortive novel idea’s outline), I figured… I might as well use the setting for the basis of my new Dungeon World campaign with friends! So that is its own bucket of “well, instead of elves, dwarfs and orcs we have lizard, frog, beetle and bird races,” etc. Annnd… I’d be lying if I said I wasn’t tempted to throw together a setting handbook for that, so other people could take a look at the world and races and custom classes, etc, and see if it interested them.