I play Trackmania, a racing game wherein there are many tricks that are most optimal on an analog input device. Since I used my mouse buttons to steer like a keyboard, I could not adequately perform these tricks to the level I would have liked.

I used uinput to turn the mouse movements into a virtual joystick. This idea is not new (in fact, quite a few other folks have already made similar tools), but I made my own personal one for maximal control.

While not an overly complicated tool, I had fun making it and use it every now and then in Trackmania tracks when I need to pull off a trick that requires it.