Sidekick Browser

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Opera

Otter Browser is a cross-platform, free and open-source web browser that is designed to be very modular. With Otter Browser, the user can replace whole bookmarks manager or history viewer by the use of plugins and the built-in abstraction layer. The browser is built with the Qt WebEngine as a wrapper around Chromium and released under the GPLv3 and is available for Linux, macOS, and Windows platforms.

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.

Lucid Browser is a free and open source mobile web browser designed to be lightweight, fast, and simple. The application is designed for quick start-ups and simplistic, while still providing features seen in other popular mobile web browser.Lucid Browser is available for Android and weighs in at only 4MB in total.

Firefox is a free and open source web browser developed by Mozilla Foundation and the community. Roughly 250 million people use Firefox to browse the web daily. The browser is loved by many and in the open-source world it's seen as the defacto web browser. Firefox is highly extensible, and provides an ecosystem for thousands of third-party add-ons, that can be used to extend the capability of the software. According to tests the Firefox outperform similar web browsers like Google Chrome and Safari. The Firefox project also takes deep pride in preserving user privacy in a world where more and more personal data is collected.

Vivaldi is a free web browser developed by the co-founder of Opera Software Jon Stephenson von Tetzchner and Tatsuki Tomita. The browser was first released in 2016, when it set out to rival other popular web browsers with a new take on UI and UX. Vivalid is a fast browser that gives you as a user ton of control over your browsing experience while at the same time respecting your privacy and security.

Brave is a free and open-source web browser that automatically blocks ads and website trackers. The brave browser is built with a strong focus on privacy and security for the end user. The browser also includes a cryptocurrency wallet that can be used to reward content creators and sites that the user visit with Basic Attention Tokens.