This is a list of things that I either made myself or have worked on or contributed to in some way. The list is quite short for now, but I hope to be able to list more things here in the future.
While I (admittedly) have almost no programming knowledge and can only make small changes to basic C code, I've implemented many machines to 86Box (all of which use already emulated hardware) over the last couple years, although sometimes with help from the actual developers. Remarkable machines I've implemented include (roughly sorted from oldest to newest):
Aside from these, I've also fixed or improved many of the existing machines, including adding the proper FSB and voltage limits to all of the 486 machines (previously, you could install pretty much any 486 CPU into any 486 board, which was very inaccurate). I've also found multiple machines that I couldn't add myself but were later added by one of the developers. Finally, I also improved/rewrote most of the strings in the Turkish translation, either to make it more understandable or to match it more closely with the original English translation (or both).
I am a curator at TRW and sometimes add new motherboards, pictures, drivers or info. either found myself or based on submissions from other people. I also take decent pictures of my own parts and add them to their relevant entries. My best pictures include those for MSI MS-6199VA, ECS P6BXT-A+ and QDI Advance 6E; along with this generic S3 ViRGE/DX I have. I also sometimes rephrase notes on existing entries to make them easier to read.