Proxy Check is a proxy detection API offered under free and paid plans. It provides IP data such as network, privacy and operator information, and the documentation describes a v3 API with support for the v2 API until 2035.
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IP2Location provides a free IP lookup demo that reports geolocation and proxy data for an IP address. Results include country, region, city, coordinates, ISP, usage type, ASN, and proxy status. The demo uses the IP2Location DB26 geolocation database and IP2Proxy PX12 proxy database, and also shows an IP geolocation API response.
IP Intelligence is a free real-time service that determines how likely an IP address is a proxy, VPN, hosting or bad IP, returning a probabilistic value between 0 and 1. It uses machine learning and probability theory with dynamic checks against large datasets. The API requires no key or sign-up, and an optional residential proxy detection flag is available.
Hitch is a scalable, open source SSL/TLS proxy based on libev. It handles large numbers of connections on multicore machines, supports TLS 1.0, 1.1 and 1.2, and is the successor of the Stud project. It is licensed under a 2-clause BSD license and has been tested on Linux.
Iocaine is an aggressive defense mechanism that tries to poison AI crawlers and other unwelcome bots by serving them garbage, rather than making them go away. It is designed to be lightweight and efficient, spending as few resources as possible while making the life of crawlers more expensive. It is intended for use together with a reverse proxy.
IP Location is a web tool that checks a visitor's public IPv4 and IPv6 address and shows approximate IP geolocation, ISP, organization, ASN, time zone and privacy signals such as VPN, proxy or Tor status. It also offers an IP address lookup field and a bulk IP lookup option. Lookup data is provided by IP2Location.
mitmproxy is a free and open source interactive HTTPS proxy. It can be used to intercept, inspect, modify and replay web traffic, including HTTP/1, HTTP/2, HTTP/3, WebSockets and other SSL/TLS-protected protocols. It offers a command line interface, a graphical web interface, and a Python API for writing addons and scripts. Downloads are available for Windows, Linux, macOS and Docker.
ZAP, the Zed Attack Proxy, is a free and open source web app scanner maintained as a community project. It provides options for security automation, including packaged scans and an automation framework, and a marketplace of community-contributed add-ons.