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Kinda lame compared to what other people post here, but this is what probably 90% of the "I just use it myself" software is IRL:

- the most "impressive" one right now, though barely realized since I've just had the idea this week, is a debug/log library that spawns child multiple processes with consoles attached (since you can allocate just one console to a process in windows) and allows for debug info stream separation and rich-ish text features like color

- i've started writing a custom "set of commands" (90% IO, tied to a specific hardware modules, no algebraic functions or anything, so not exactly a programming/scripting language) language specifically for, sort of, programming-illiterate people so that they could easily implement test algorithms without asking software devs to do it. It got nowhere bc I didn't have time to implement it

But my a high level hardware emulator I'm using to debug GUI in production-ish environment uses whatever is left of it.

- environment management software that assigns PATH and other variables. Those commonly ship with software, but I havent really seen people writing their own for general env management

- my friend couldn't get Sony Vegas to produce good chromakey results, so he cobbled together some javascript to do it

- I've built a python notebook to analyze my bike rides combining Garmin Watch (gps + HR) and OSM data (estimating speed vs power vs road conditions).

- since (last I've checked was like a year ago) cmake devs value json adherence over readability in CMakePresets, I've written some scripts that convert jsonc to json. Also, those can convert string arrays to strings and add other QoL and readability improvements

- also, since CI/CD pipeline at work uses pretty old cmake that doesn't support presets and is a ton of work to upgrade due to it being airgapped (I will not elaborate), I've written a script that converts a preset into a shell script. Not completely, just the options I use.

- i guess a lot of custom diagnostic software I've written at work, though that doesnt really count since this is what I'm actually supposed to be doing, instead of most of the above and jeneral software shenanigans




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