Rather than the usual contrived ‘Hello World’ examples, I decided to build a break-out clone: Breakanoid!
After working in a Web Agency environment for quite a few years I found that, more often than not, estimates for work were required before having the full picture. I prefer a bit more structure than just a finger in the air (or elsewhere) to get to a number so I put together Estimator - a little tool to help derive estimates for projects.
Way back in the mid to late nineties, before 3D accelerator cards were even a thing, I used to dabble in 3D graphics inspired by the Demoscene. Using Borland Turbo Pascal 7 and embedded Assembler, for the bits that just needed pure speed, I built a few simple demos which, sadly, never saw the light of day.