Mozilla releases the first nightly builds of its next generation web rendering engine, code-named Servo. This is the first technical demonstration of Mozilla's much awaited high-performance, next-gen web-browser engine being developed for application and embedded use. The first nightly builds also come with a very basic HTML based browser UI so that you can experience the new Servo engine first hand.
Mozilla's New Servo Browser Engine
Being developed at Mozilla Research, Servo engine is also being ported to Android and ARM processors by Samsung. The project "seeks to create a highly parallel environment, in which many components (such as rendering, layout, HTML parsing, image decoding, etc.) are handled by fine-grained, isolated tasks." Source code for the project is written in Rust programming language. Also according to wikipedia, Servo is named after Tom Servo, a robot from a 1980s television show, Mystery Science Theater 3000.
Downloadable snapshots of Servo available here (for Mac OS X and Linux only for now). These pre-built nightly snapshots are not anywhere near ready for regular use yet though. Happy testing.