A new maintenance release of OGRE 1.7.x (codenamed Cthugha) is available. You can download the SDK, sources and demos from this page.
OGRE 1.7.3 does not bring new features, it’s only a bugfix / update release. The complete changelog is available HERE.
OGRE is one of the most popular 3D rendering engine and is available for Windows, Linux, Mac OS X and iPhone. OGRE supports all modern rendering paths: OpenGL, Direct3D 9, Direct3D 10 and Direct3D 11.
You can browse this page for a selection of real-world projects using OGRE: