Catalyst is a niche, independent web browser for Windows, developed by a single programmer, César Claudio Lóriga González. It has been in active development since around 2016.
The project was eventually abandoned, its website shut down, and it is now considered obsolete and unsafe to use. It is remembered as a charming but unsuccessful experiment in browser design.
Blue Hawk is a highly specialized, niche web browser focused on maximum security, now considered obsolete and unsafe
Polypane is a specialized, premium web browser built specifically for web developers and designers
NetSurf is a free, open-source web browser designed to be fast, lightweight, and highly standards-compliant, particularly for legacy and embedded systems
BriskBard is a niche, independent browser that prioritizes performance, customization, and privacy, born from one developer's ambitious technical project
Agregore is an experimental browser for developers and explorers building a user-owned web where content is shared directly between devices
Dillo is the ultimate browser for raw speed and efficiency when you only need to display simple web content, serving as a stark contrast to the bloat of modern browsers
Links is the ultimate hacker's browser for the terminal—proving that you don't need a graphical interface for powerful, efficient web browsing
Xombrero was a highly principled, "paranoid" browser that offered maximum control and security but ultimately couldn't keep pace with the modern web
WebPositive was the beloved, native browser that gave the Haiku OS its first true taste of the modern web
Surf is essentially a "window to the web" that eliminates all browser chrome to provide the most distraction-free browsing experience possible.