- css
- flexbox, online - https://flexboxfroggy.com/
- selectors, online - https://flukeout.github.io/
- concurrency, c#, online - https://deadlockempire.github.io/
- git
- offline - https://ohmygit.org/
- online - https://learngitbranching.js.org/
- regex
- online - https://regexcrossword.com/
- online - https://alf.nu/RegexGolf
- vim, online - https://vim-adventures.com/
inspired by: https://twitter.com/b0rk/status/1535704366304337921?cxt=HHwWgoCxmYK_9c8qAAAA