Scrapoxy hides your webscraper behind a cloud.

It starts a pool of proxies to relay your requests.

Now, you can crawl without thinking about blacklisting!

Nuster is a high performance caching proxy server based on HAProxy. It is 100% compatible with HAProxy, and takes full advantage of the ACL functionality of HAProxy to provide fine-grained caching policy based on the content of request, response or server status.

Envoy is an L7 proxy and communication bus designed for large modern service oriented architectures.

Give your teams a single source of truth for every component they use.
Optimize build performance and reliability by caching proxies of remote repositories.
Provide universal coverage for all major package formats and types.
Install on an unlimited amount of servers for an unlimited amount of users.

Supports Docker, npm, bower, NuGet

toxy is a fully programmatic and hackable HTTP proxy to simulate server failure scenarios and unexpected network conditions, built for node.js/io.js.

The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications.

It is designed to be used by people with a wide range of security experience and as such is ideal for developers and functional testers who are new to penetration testing.

ZAP provides automated scanners as well as a set of tools that allow you to find security vulnerabilities manually.

mitmproxy is your swiss-army knife for debugging, testing, privacy measurements, and penetration testing. It can be used to intercept, inspect, modify and replay web traffic such as HTTP/1, HTTP/2, WebSockets, or any other SSL/TLS-protected protocols. You can prettify and decode a variety of message types ranging from HTML to Protobuf, intercept specific messages on-the-fly, modify them before they reach their destination, and replay them to a client or server later on.

Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).

miniProxy is a simple web proxy written in PHP that can allow you to bypass Internet content filters, or to browse the internet anonymously. miniProxy is licensed under the GNU GPL v3. miniProxy is the successor to pageForward.

CoralCDN is a free and open content distribution network based around peer-to-peer technologies, comprised of a world-wide network of web proxies and nameservers. It allows a user to run a web site that offers high performance and meets huge demand, all for the price of a $50/month cable modem.