This is the page that gives detailed information about the software itself.
Realxtend is created based on the idea of SecondLife. SL does not provide their server code as open source and hence no one can run SL server or their own SL universe. realxtend was based on the OPENSIM project and still have many close ties to it.
At the moment, realxtend is on its' 0.5 version and is seen much more powerful compare to the traditional SL. however, this does come with certain sacrifice in stabilities.
We hope to use realxtend to establish a open source environment to allow teaching of anatomical structures.