Ahruna was a game I played together with a few people, it's a follow up on castlequest2. The reason I list it, is because I created some tools for our alliance to log things and make some complex calculations from inputs.
It was written as multiple modules, eg:
One available to everyone to keep track of donations.
A more amazing one: a tool to find best combinations between something called melodies,
for those things statistic images could be generated and used in our alliance forums.
Another tool was to calculate a list of missing gems for those melodies, its results could also be generated as an image.