None on personal computer. On school computer I have Foxy Proxy. There’s school proxy server and I kind of provide 2 of my own. For that I use Android Proxy server app from Google Play. Unfortunately I didn’t find anything similar on F-Droid.
First one is HTTP proxy which allows me to go through VPN and use DNS server of my choice and second is TCP relay to Orbot because why not. So I can just connect to school WiFi and start those proxy servers. I also tried SOCKS5, but that seems to ignore my DNS settings, so I don’t use that. Also I don’t need it anyway.
It allows me to quickly switch between proxy servers. Pretty convenient.