SIC TRANSIT GLORIA MUNDI
Our suggestions
Columns filled with numbers turned into images
ECMAScript (Javascript) library, distributed under the GPL license, that creates charts from (x)HTML tables.
Sunrise and sunset, all year long, anywhere
Graphs of sunrise/sunset and time of light for any place in the world.
Thirteen cards and 635,013,559,600 possibilities
Scoring tables, bidding system and memory cards for the game of bridge.