I am looking for more work at the moment, so I might not have unlimited free time in the future but:

I know embedded hardware and software, Python, and some web dev.

My FOSS projects worth mentioning are KaithemAutomation, an IoT automation system focusing on more low level control for commercial installs, and HardlineP2P, a protocol for P2P remote acess(think DuckDNS replacement).

I'm also working on an open source math reference guide for people who have no math knowledge. I have no particular math talent, so I'm documenting how I'm able to work effectively without really being able to manipulate these things mentally.