xombrero is a minimalist's Web browser. It strives to be vi-like and is suited for heavy keyboard users.
mcwm is a minimalistic window manager implemented using XCB. It doesn't use libX11 at all. It is a traditional floating window manager with no fancy smarts like those in modern tiling window managers.
An full text search engine and column store..
A deduplication-based filesystem for Windows and Linux (SDFS).