An interesting series of video lessons matching programming instructions and algorithms with processor architectures and assembly equivalents.

NOT free!

A ESP32 + WS2812 project with a simple webserver to reponse to blink on GET requests, in a case whichs looks like a cloud.

Nice little diy project!

Amazing list of digital versions of boardgames.

PEASS - Privilege Escalation Awesome Scripts SUITE (with colors) - peass-ng/PEASS-ng

An amazing introductory book for jujutsu

A very nice GUI client for git. Nice design and pretty functional layout - somewhat reminiscent of GitKraken

Voice control: transform various alphabet's and morphemes (graphemes?) into actions on the pc.

Fun demonstration here: https://numenvoice.org/

Can for example translate 'terminate' into closing a window, or 'west' into focusing left tile in a tiling wm, or 'yes' into return on the terminal.

Seems fun for regular use but really useful for those who can not regularly use their hands to type for whatever reason.

A personality test which seems (at least somewhat) grounded in backing science.
And open source, which is nice!

TUI for Jujutsu/jj, similar to lazygit for git.

Tabletop Simulator-like

Tabletop Playground - TTS clone, commercial but with a wider variety of games? (claimed). Can import TTS games afaik. Games can be found here

Tabletop Club - FOSS TTS clone, not sure how far along? can not import TTS games atm

Vassal - FOSS, originally developed for tabletops afaik, older but actively developed and huge selection of modules (though still w focus on deeper/wargame-like games).

OCTGN - full game engine but I only know it from ppl playing Android Netrunner on it

Web-arenas

virtualtabletop - free, no official game art etc but works without signup!

boardgame arena - freemium, many games

boardzilla - FOSS, no signup required. Very limited selection of games currently (basically 7WondersDuel, PowerGrid and 7 others) but nice that it exists!

tabletopia - a huge selection (2500+?) but very freemium, I think moreso than bga

Mostly - FOSS but mostly 'classic' card games (Doppelkopf, Bridge, Skat, ...)