Iridium Browser is a privacy-focused build of Chromium. It removes additional telemetry features, provides various enhancements for stricter security without compromising compatibility or sacrificing modern features. Hosted on a fully public repository and its development funded by the Open Source Business Alliance. And the project provides builds for many common distributions and plattforms.
Eilat provides a minimal Qt/WebKit-based browser window. It's written in Python and primarily provides keyboard interaction. It's focused on security and privacy by isolating web site instances and avoiding a cache, persistent cookie storage, but logs actually retrieved network resources. It provides limited bookmarking, but no file download support.
K-Meleon is an extremely fast, customizable, lightweight web browser for Windows. It's based on Mozillas Gecko layout engine (like Firefox). It provides a classic tabbed browser interface with lots of customization options.