This one's a pretty loose fit for the jam. Sorry about that!

Gaze is a hex editor that tells you what the bytes actually mean. It consists of a parser in Zig and a UI (which ended up in HTML/CSS — I did start with an immediate mode UI in Zig but I found that I needed a more mature UI system to get the design proper.) Currently it only supports parsing Windows BMPs (there's also OS/2 BMPs which aren't supported), but what's there so far is a solid foundation to continue to build upon.