Awesome
blender-xray 
X-Ray Engine import/export addon for Blender.
Supported formats
| Extension | Description | Can import | Can export |
|---|---|---|---|
| .object | Source models | Yes | Yes |
| .skl | Skeletal action | Yes | Yes |
| .skls | Skeletal actions | Yes | Yes |
| .ogf | Compiled models | Yes | Yes |
| .omf | Game skeletal actions | Yes | Yes |
| .anm | Animation paths | Yes | Yes |
| .bones | Bones data | Yes | Yes |
| .dm | Detail model | Yes | Yes |
| .details | Level details | Yes | Yes |
| .level | Scene selection | Yes | Yes |
| level | Game level | Yes | Yes |
| .part | Scene objects | Yes | Yes |
| .group | Object groups | Yes | Yes |
| .err | Error list | Yes | No |
Documentation
Follow wiki.
License
Almost all the code is published under the liberal terms of the BSD License, see the LICENSE file. The only exception is the LZHUF module (see special copyrights there).