Stunt Rally 2.5 (freeware) ~ You Greeks

The game features 167 tracks in 34 sceneries, 19 cars + 4 vehicles and a Track Editor.
It focuses on closed rally tracks with possible stunt elements (jumps, loops, pipes).

Install

Releases are here: DOWNLOADS and run on GNU/Linux and Windows.
See Install on how to use. Check Hardware Requirements.
The latest version is 2.5 (3 November 2014)

About

Car simulation is done by VDrift also using bullet. Rendering by OGRE.
Trees/grass by PagedGeometry, Gui by MyGUI, materials managed by shiny.
Road is based on a 3D spline and it's fully customizable in editor.
For developers, check Roadmap and Issues.