List of free proxy stuff for developerππ½
If you're looking for all programming tools around proxy (not just free). Check this page List of proxy Programming Tools
Traefik Labs: Proxy
Traefik is the leading open-source reverse proxy and load balancer for HTTP and TCP-based applications that is easy, dynamic and full-featured.
Tag: https, proxy
check it out at https://traefik.io/pricing/
Localtunnel
Free local server to public internet tunnel. Ngrok alternative. Expose yourself to the world
Tag: proxy, local-server, tunnel

ngrok
ngrok is the fastest way to put anything on the internet with a single command.
Tag: proxy, local-server, tunnel
Ephemeral/Random Domains Serve HTTP Apps, Webhooks, APIs, and TCP-based systems Automated SSL/TLS certificates Request Inspection & Replay APIs and Terraform Provider Restricted bandwidth and usage

Loophole
Instant hosting, right from your local machine. It's totally free and excellent alternative to ngrok
Tag: proxy, local-server, tunnel