The latest release is version 0.8.1. You can build the engine easily from the files in the source packet, which can be downloaded from the link here.
|Version 0.8.6.2 (alpha), 2009 - Dec 13|
|Version 0.8.x, 2005 - 09/14|
|Source and binaries (version 0.8.0)||tar.gz, 3.2MB|