Free and Open Source Software
Lynx
Lynx is a customizable text-based web browser for use on cursor-addressable character cell terminals. The Lynx browser is avalible for UINX, MacOS, VMS, Windows 95/98/NT, DOS386+. As of 2020, Lynx is the oldest web browser still being maintained, having started in 1992.
Zorin OS
A Linux distribution that is designed from the ground-up to be a replacement for Windows or macOS. With Zorin OS you can get to know Linux quickly with a desktop environment similar to your previous experience with the commercial operating systems. Zorin OS let's you choose a desktop layout that mimic your previous OS, be it Windows or macOS. The operating system is built on-top of Ubuntu and runs on the same open-source software that powers the U.S. Department of Defense, NASA, and more.
Otter Browser
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.
ProtonVPN
ProtonVPN is a virtual private network service provider operated by the Swiss company Proton Technologies AG, the provider of ProtonMail. Just like ProtonMail, ProtonVPN is a community supported project that aims to build a safer Internet that also protects civil liberties. The service provides a strict no data logging policy, that ensures that no personal data is kept by ProtonVPN. It also has Tor integration and SecureCore servers for additional security if needed. Currently, ProtonVPN provides over 560 servers in more than 40 countries.
OperaVPN
OperaVPN is a great means for unblocking the website over the internet with a one tap.
Opera Beta
If you are looking for features planned for the next version of Opera, then Opera Beta is for you. With Opera Beta you can get a peak of and beta test new features that will be released in the upcomming release of the Oprea Browser. Allowing you to early test new features and contribute to development of the browser.
Opera Developer Browser
With Opera Developer Browser you can join in on the earliest experiments for the browser. The browser is recommended to be used by developers, enthusiasts and advanced users. Opera Developer Browser and Opera Beta Browser was introduced to improve the development cycle of the browser and to beta tests new version before final release, to the public.
C
C is a free and open-source general-purpose, procedural programming language. The language supports structured programming, lexical variable scope, and recursion, with a static type system. By design, C provides constructs that map efficiently to typical machine instructions. C was first created and released in 1972 at Bell Labs by Dennis Ritchie, today C is used in systems where you need absolute control over memory management such as OS kernels and other mission critical software.
ReactOS
ReactOS is a free and open-source Windows-like operating system for amd64/i686 computers. ReactOS was designed to be binary-compatible with computer programs and device drivers made for Windows Server 2003 and Microsoft Windows NT family of operating systems including Windows NT4, Windows 2000, Windows XP, Windows 2003, Windows Vista and Windows Seven. To Some, ReactOS is a potential open-source drop-in replacement for Windows and for its information on undocumented Windows APIs
Baidu Browser
Baidu Browser, previously known as Baidu Spark, is a Chromium-based web browser. The browser utilize the same engine as Google Crhome while providing and attractive UI, changeable skins, video download and screenshot capture and seamless integrations with social networks like Facebook.