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Beaker Browser

A free and open-source web browser based on Goanna. Pale Moon is designed and developed with an emphasis on customizability, hence their motto "Your browser, Your way". The browser is available for Linux and Windows and is a for of Firefox with substantial divergence to make it as customizable as possible.

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Tor Browser is free and open-source software that guarantees anonymity online through the onion router. It enhances your security and safety while using the internet and is a favorite choice for people who want to browse the web anonmously. The Tor Browser helps you anonymize publishing, web surfing, instant messaging and other functions, using the TCP protocol.

ZeroNet is a decentralized web-like network of peer-to-peer users. It's basically BitTorrent thrown at the problem of web hosting and networking. With ZeroNet you can create open, free and uncensorable websites using cryptograic features of Bitcoin. ZeroNet uses .bit domain names and a decentralized domain regestry using Namecoin.

Sandcat is a free and open-source browser designed for penetration testers and is used for testing security holes and bugs in websites and web applicaitons. The Sandcat Browser is developed by Syshunt on top of Chromium and uses the Lua programming language to provide extensions and scripting support. Although the browser is directed towards system administrators and penetration testers, it can be useful for people who want to verify in real-time how they are tracked online.