3proxy vs FoxyProxy

3proxy is a free proxy server for controlling access between internal users and external resources, or between external users and internal resources. It supports HTTP and HTTPS proxying, SOCKS v4, v4.5 and v5, and FTP over HTTP. Other services include POP3 proxying, TCP and UDP port mapping, and a caching DNS proxy. Access controls can set bandwidth and traffic limits, chain proxies, and rotate logs. Logging can use files, Unix syslog, or an ODBC database, with configurable formats. When compiled with OpenSSL, 3proxy offers HTTPS proxy connections, upstream TLS with certificate authentication, and mutual TLS. Its security guidance recommends limiting access with ACLs and notes that its documented strong authentication method currently uses cleartext authentication. It runs on Linux, macOS, Windows, and self-hosted setups; Docker images are available, and Windows system-service installation is described. Release binaries are published with checksums, an OpenPGP signature, and a build provenance attestation; Docker images are signed and attested. The listed plan is free.

FoxyProxy has no write-up on Specifiction yet; its figures are above.