Code:
https://openproxy.space/list/http
https://openproxy.space/list/socks4
https://openproxy.space/list/socks5
https://free-proxy-list.net
https://vpnoverview.com/privacy/anonymous-browsing/free-proxy-servers/
http://proxydb.net/?protocol=http
http://proxydb.net/?protocol=https
http://proxydb.net/?protocol=socks4
http://proxydb.net/?protocol=socks5
https://www.us-proxy.org/
https://premiumproxy.net/
https://www.netzwelt.de/proxy/index.html
https://api.proxyscrape.com/v2/?request=displayproxies&protocol=http&timeout=10000&country=all&ssl=all&anonymity=all
https://api.proxyscrape.com/v2/?request=displayproxies&protocol=socks4&timeout=10000&country=all
https://api.proxyscrape.com/v2/?request=displayproxies&protocol=socks5&timeout=10000&country=all
https://www.proxy-list.download/HTTP
https://www.proxy-list.download/HTTPS
https://www.proxy-list.download/SOCKS4
https://www.proxy-list.download/SOCKS5
https://www.freeproxy.world/
https://free-proxy-list.net/
https://smallseotools.com/de/free-proxy-list/