I have searched and found 19 web browsers.
Listed here you can read a little about each, and see if they are available for your prefered operating system.

Arora is a lightweight, cross-platform, free and open-source web browser developed by Benjamin C. Meyer. Arora is available for Linux, Mac OS X, Windows, FreeBSD, OS/2, Haiku, and any other operating system supported by the Qt toolkit. Arora's name is a palindrome.
The browser's features include tabbed browsing, bookmarks, browsing history, smart location bar, OpenSearch, session management, privacy mode, a download manager, WebInspector, and AdBlock.
For several months, Meyer discontinued development of Arora due to uncertainty about the strictures of non-compete clauses by his employer; finally in July 2011, he announced that he would no longer contribute to the project.
Another software developer, Bastien Pederencino forked Arora's source code, and published a variant called zBrowser - renamed Zeromus Browser in February 2013. In May 2013, Pederencino published another variant called BlueLightCat. In February 2014, some new patches were released on Arora's github project page, with some Linux distributions incorporating the changes in their individual versions of Arora packages in their repositories.

Wikipedia says:
Brave is developed by Brave Software, which was founded on May 28, 2015, by CEO Brendan Eich and CTO Brian Bondy. On January 20, 2016, Brave Software launched the first version of Brave with an ad blocking feature, and announced plans for a privacy ad feature and a revenue sharing program.

In June 2018, Brave released a pay-to-surf test version of the browser. This version of Brave is preloaded with approximately 250 ads, and sends a detailed log of the user's browsing activity to Brave for the short-term purpose of testing this functionality. Brave announced that expanded trials will follow. Later that month, Brave added support for Tor in its desktop browser's private browsing mode.

Until December 2018, Brave ran on a fork of Electron called Muon which was marketed as a "more secure fork". Nevertheless, Brave developers moved to Chromium citing a need to ease their maintenance burden. The final Muon-based version was released with the intention that it would stop working and instruct users to update as the end of life approached.

In June 2019 Brave started testing new ad-blocking rule matching algorithm implemented in Rust that Brave claims is on average 69 times faster than the previous implementation in C++. The new algorithm is inspired by the uBlock Origin and Ghostery algorithms.

Brave launched its stable release version 1.0 in November 13, 2019 while having 8.7 million monthly active users overall. At the time, it also had approximately 3 million active users on a daily basis. Brave I.0 was made available for Android, iOS, Windows 10, macOS, and Linux, and integrated "almost all of Brave's marquee features across all platforms," according to engadget.

Google Chrome is the basis of Google's Chrome OS operating system that ships on specific hardware from Google's manufacturing partners. The user interface has a minimalist design resembling the Google Chrome browser. Chrome OS is aimed at users who spend most of their computer time on the Web; the only applications on the devices are a browser incorporating a media player and a file manager.
Chrome overtook Firefox in November 2011, in worldwide usage. As of June 2016, according to StatCounter, Google Chrome had 62% worldwide desktop usage share, making it the most widely used web browser, while Firefox had 16% and Internet Explorer had 12%.
Along with Safari and Mozilla Firefox, Chrome receives a weekend "bump", which boosts its market share by as much as three percentage points on week-ends, at the expense of Internet Explorer

Chromium is an open-source web browser project from which Google Chrome draws its source code. The browsers share the majority of code and features, though there are some minor differences in features and they have different licensing.
The Chromium Project takes its name from the element chromium, the metal from which chrome plating is made.
Google's intention, as expressed in the developer documentation, was that Chromium would be the name of the open-source project and that the final product name would be Chrome; however, other developers have taken the Chromium code and released versions under the Chromium name. These are listed under community packages.
One of the major aims of the project is for Chromium to be a tabbed window manager, or shell for the web, as opposed to it being a traditional browser application. The application is designed to have a minimalist user interface. The developers state that it "should feel lightweight (cognitively and physically) and fast.

Dooble is a free and open source Web browser. Dooble was created to improve privacy. Currently, Dooble is available for FreeBSD, Linux, OS X, OS/2, and Windows. Dooble uses Qt for its user interface and abstraction from the operating system and processor architecture. As a result, Dooble should be portable to any system that supports OpenSSL, POSIX threads, Qt, SQLite, and other libraries.

Wikipedia say; Originally built with Microsoft's own EdgeHTML and Chakra engines, in 2019 Edge was rebuilt as a Chromium-based browser, using the Blink and V8 engines. As part of this change (codenamed Anaheim), Microsoft has made the preview builds of Chromium-based Edge available on Windows 7, 8, 8.1 and macOS, in addition to Windows 10. As of September 2019, only preview builds of Chromium-based Edge are available. Microsoft intends to release the first Chromium-based Edge version on January 15, 2020.

According to StatCounter, in August 2019 Edge overtook the market share of Internet Explorer (IE) on PC, Edge in fourth place and IE in fifth. While IE's share dropped, no single version of Edge is more popular than Internet Explorer 11. The market share for Edge remains low, with IE following in this trend. However, combining the market share of Edge and IE, Microsoft's browsers are third place in PC browser market share, Chrome being first and Firefox second. Mobile versions of Edge exist for Android and iOS, however they have little to no market share. On Microsoft consoles, Edge replaced IE as the dominant browser a few months after its release in 2015.

GNOME Web (originally called Epiphany from 2003-2012) is a free and open-source web browser for the GNOME desktop environment. The browser was forked from Galeon, after developers' disagreements about Galeon's growing complexity. Since then Web has been developed as part of the GNOME project and uses most of GNOME's technology and settings when applicable. It is part of the GNOME Core Applications. As required by the GNOME Human Interface Guidelines (HIG), Web maintains a clean and simple graphical user interface with only a required minimum number of features exposed to users by default. The browser's functionality and configurability can be extended with official and third-party extensions. Instead of developing a custom web browser engine Epiphany originally used the Gecko layout engine until version 2.28 and WebKit GTK+ starting with version 2.20. This approach allows the relatively small developer community to maintain a sufficient level of modern web standards support. The features of Web include reuse of GNOME configuration settings, smart bookmarks and web application integration into user desktop. Web extensions add support for ad filtering, Greasemonkey user scripts support and other smaller, yet useful, options. GNOME Web's source code is available under the GNU General Public License from the GNOME project. The binary builds of the browser are available in the package repositories of most Linux distributions and BSD releases.

@ wikipedia is written: Falkon provides several icon sets and other elements to match the native look and feel of users' desktop operating systems. Some additional features of the browser include the integration of history, web feeds and bookmarks in a single location, the ability to take a screenshot of the entire page, and an Opera-like "Speed dial" home page. It is reported to consume fewer system resources than the major general purpose browsers like Firefox and Google Chrome.

Falkon uses the Qt cross-platform application framework and offers a built-in AdBlock. By default this adblocker whitelists the web page of Falkon's main search engine, DuckDuckGo. A "portable" (no installation) version for Windows platforms exists. Falkon is also distributed in the PortableApps format.

Firefox was created in 2002, under the name "Phoenix" by the Mozilla community members who wanted a standalone browser rather than the Mozilla Application Suite bundle. Even during its beta phase, Firefox proved to be popular with its testers and was praised for its speed, security, and add-ons compared to Microsoft's then-dominant Internet Explorer 6. Firefox was released in November 2004, and was highly successful with 60 million downloads within nine months. Firefox usage grew to a peak of 32% at the end of 2009, temporarily making version 3.5 the world's most popular browser. According to Mozilla, as of December 2014 there were half a billion Firefox users around the world.

Konqueror is a free and open-source web browser and file manager that provides file viewer functionality for file systems such as local files, files on a remote FTP server and files in a disk image. It is a core part of the KDE Software Compilation. Konqueror is developed by volunteers and can run on most Unix-like operating systems and on Windows systems. Konqueror is licensed and distributed under the GNU General Public License version 2.
The name "Konqueror" is a reference to the two primary competitors at the time of the browser's first release:
"first comes the Navigator, then Explorer, and then the Konqueror". It also follows the KDE naming convention: the names of most KDE programs begin with the letter K.
Konqueror was released with version 2 of KDE on October 23, 2000. It replaces its predecessor, KFM (KDE file manager). With the release of KDE 4, Konqueror was replaced as the default file manager by Dolphin, but is still maintained as the default KDE web browser.

About Lynx on Wikipedia: Browsing in Lynx consists of highlighting the chosen link using cursor keys, or having all links on a page numbered and entering the chosen link's number. Current versions support SSL and many HTML features. Tables are formatted using spaces, while frames are identified by name and can be explored as if they were separate pages. Lynx cannot inherently display various types of non-text content on the web, such as images and video, but it can launch external programs to handle it, such as an image viewer or a video player.

Unlike most web browsers, Lynx does not support JavaScript or Adobe Flash, which some websites require to work correctly.

About Maxthon, you can on Wikipedia read: Maxthon is a Chinese company known mainly for producing web browsers for Windows. It is headquartered in Beijing, with offices in Shanghai, Hong Kong, and San Francisco, US. Most of Maxthon's engineers are based in the corporate headquarters in Beijing, which develops and maintains versions of the Maxthon browser for Windows, macOS, Android, iOS, and Windows Phone.

Maxthon has also created other products including a Chinese language news and information portal, a Chinese language casual gaming portal and humor website, a ‘Kid Safe’ web browser for Android and iOS, a free online account system named Maxthon Passport, and an English language news and information web portal i.maxthon.comb

Midori Japanese for green) is a lightweight web browser. It uses the WebKit rendering engine and the GTK+2 or GTK+3 interface. Midori is part of the Xfce desktop environment's Goodies component and was developed to follow the Xfce principle of "making the most out of available resources". It is the default browser in the SliTaz Linux distribution, Bodhi Linux, Trisquel Mini, old versions of Raspbian, and wattOS in its R5 release. It was the default browser in Elementary OS Freya.

Opera is a web browser for Windows, macOS, and Linux operating systems. It is developed by Opera Software. On 4 November 2016 Opera's consumer business, including the browser, was acquired by a Chinese group of investors under the name Golden Brick Capital Private Equity Fund I Limited Partnership.
It is also available as Opera Mobile, Opera Mini and Opera Coast - on devices running Android, iOS, Windows Phone, Symbian, Maemo, Bada, BlackBerry and Windows Mobile operating systems, and as Opera Mini on Java ME-capable devices.
It uses the Blink layout engine. An earlier version using the Presto layout engine is still available, and runs on FreeBSD systems.
According to Opera Software, the browser had more than 350 million users worldwide in the 4th quarter of 2014. Total Opera mobile users reached 291 million in June 2015. According to SlashGeek, Opera has originated features later adopted by other web browsers, including Speed Dial, pop-up blocking, browser sessions, private browsing, and tabbed browsing.

Rekonq is a lightweight, QtWebKit-based web browser developed inside the free software project KDE. It is the default web browser of Chakra GNU/Linux, and was formerly of Kubuntu (between versions 10.10 and 13.10). rekonq has been officially included in KDE Extragear since May 25, 2010. In contrast to Konqueror, a web browser and file manager also developed by KDE, rekonq aims to be a standalone and simple web browser. Its code was initially based on Qt Development Frameworks' QtDemoBrowser and is developed on KDE Projects' Git repository. As of January 2014 there has been no further development of rekonq, and there is no manpower or sponsorship to restart.

Safari is to read about, on Wikipedia: On macOS, Safari is a Cocoa application. It uses Apple's WebKit for rendering web pages and running JavaScript. WebKit consists of WebCore (based on Konqueror's KHTML engine) and JavaScriptCore (originally based on KDE's JavaScript engine, named KJS). Like KHTML and KJS, WebCore and JavaScriptCore are free software and are released under the terms of the GNU Lesser General Public License. Some Apple improvements to the KHTML code are merged back into the Konqueror project. Apple also releases additional code under an open source 2-clause BSD-like license.

Until Safari 6.0, it included a built-in web feed aggregator that supported the RSS and Atom standards. Current features include Private Browsing (a mode in which no record of information about the user's web activity is retained by the browser), an "Ask websites not to track me" privacy setting, the ability to archive web content in WebArchive format, the ability to email complete web pages directly from a browser menu, the ability to search bookmarks, and the ability to share tabs between all Mac and iOS devices running appropriate versions of software via an iCloud account.

Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux (with other operating systems in development), focusing on efficiency and customization. Make sure to get the most out of your browser!

Pale Moon offers you a browsing experience in a browser completely built from its own, independently developed source that has been forked off from Firefox/Mozilla code a number of years ago, with carefully selected features and optimizations to improve the browser's stability and user experience, while offering full customization and a growing collection of extensions and themes to make the browser truly your own.

Vivaldi is a freeware, cross-platform web browser developed by Vivaldi Technologies, a company founded by Opera Software co-founder and former CEO Jon Stephenson von Tetzchner and Tatsuki Tomita. The browser was officially launched on April 12, 2016. The browser is aimed at staunch technologists, heavy Internet users, and previous Opera web browser users disgruntled by Opera's transition from the Presto layout engine to the Blink layout engine, which removed many popular features. Vivaldi aims to revive the old, popular features of Opera 12. The browser has gained popularity since the launch of its first technical preview. The browser has 1 million users as of January 2017.

Welcome to the newst incarnation of You can now find some texts here. About Web developing in a OSS environment, a new document. My old ebook about photography, while we wait for the second edition.. The old text; "The Creative Kitchen". The PHP snippet collection. Find some valuable tips here.... and ofcource you still find the photo album here also.