I do a lot uf useless and experiment software, like these:

https://namechecker.leandrosf.com/ -> Check if your pretended project name is already used in somewhere

https://github.com/lsferreira42/bli -> a brainfuck interpreter that is intended to help you understand brainfuck

https://github.com/lsferreira42/nadb -> a threaded key value store with memory buffering

https://github.com/lsferreira42/hnpes -> a hackernews chrome extension to find previous posts of the url your are browsing

All of them work, but not at all usefull hahahaha