Cobalt is a practical security-focused desktop operating system forked from OpenBSD.

Reasonably Lightweight — Cobalt takes a zero-tolerance approach to bloatware and in-auditable cruft:

• Features a unique fork of the NetSurf web browser, instead of a heavyweight such as Chrome or Firefox, or an overly limited text-based browser such as Links or Lynx.
• Entirely independent from the FreeDesktop.org, GNOME and RedHat ecosystems: Cobalt does not depend on polkit, dbus or glib.
• 100% written in C. In fact, the entire system is configured to be built using TinyCC. C++ is optional, as are any colossal compiler toolchains such as LLVM/Clang or GCC.

Build for the Desktop — Not just for your server.

• Uses JWM with an Openbox-esque feel
• Excellent codec support provided by ffmpeg
• Extensibility and modification made easy with LuaJIT