Sorry for the necro, but I imagine that some people here could be interested:
https://www.gog.com/forum/general/enhanced_gog_userscript_adds_isthereanydeal_integration_to_game_pages

Enhanced GOG is a script that follows the same idea as Augmented Steam, fetching price information for games on GOG.
It appears to support most regions ITAD supports too.

For a gamer I'd say Legend of Zelda: A Link to the Past. :D

JoyToKey

A tool that lets you map gamepad buttons to keyboard keys. Have been using this for years, recently to get a gamepad to work with VICE (Commodore 64 emulator).

Goverlay; an extension of several useful utilities into one tool; like those fancy AMD or Nvidia control panels but without all the extra junk.

Does this work on Windows too?

ImDisk - Ramdisk tools and CD mounting more natively
7-Zip - Archiving/Extraction tools for common archives

I would recomend 7-zip-zst instead. It's the same good old 7zip but with aditional compression methods including ZStandard, wich became very popular in the last couple of years.

7-Zip zstd
Isn't MSI Afterburner/RivaTuner not good enough?
You can also display many statistics via your gamer™ GPU control panel. Alternatively Fraps or FPS-monitor can to the job.

You certainly could try to compile but laughs.
Well, does MSI Afterburner/RivaTuner exist for the platform in question?

Necro but possibly worth it:

GOG Checksum Lookup:
https://openuserjs.org/scripts/xmanacollectorx/GOG_Checksum_Lookup/
Adds a button to check on https://www.gog.com/account

GOG Orders history prices summary:
https://greasyfork.org/en/scripts/14022-gog-orders-history-prices-summary
Adds a button to check on https://www.gog.com/account/settings/orders

Pages listing alternatives to subreddits, now that Reddit's CEO is burning the site to the ground:
https://sub.rehab/
https://www.quippd.com/writing/2023/06/15/unofficial-subreddit-migration-list-lemmy-kbin-etc.html
Not directly related to gaming, but useful for it too.