I host my code at git.beyermatthi.as.
There are source repositories of code I developed, contrib repositories where I contributed patches and mirrors of repositories that I find valuable.
Feel free to send me patches (git-send-email.io) to any of the source repositories.
You can also find me on sr.ht and contribute patches via its mechanisms.
You can also find me on Microsoft Github, but I encourage you to not use it and I am in the progress of gradually moving away from its closed-source nature and ecosystem.