makehuman has seconlife export option

makehuman is designed to make human polygon as free software. It can export mesh object for several formats, includes collada.
If you select collada export, also you can select "Use second_life rig" option.
To export colllada for second life, check the following options.
- Rotate 90X
- Rotate 90Y
- meter
- Use second_life rig

Already rigged and weighted! You don't need adjust by blender, you can upload it as shape model into secondlife directly.

Also this is collada therefore import it into Blender and using PMX exporter, you can make PMX model. (don't forget changing axis-world and PMX bone should be used and weighted.)

makehuman

http://www.makehuman.org/

Enjoy!