I received the following announcement:
The Project Darkstar team at Sun Microsystems Laboratories is pleased to announce that Project Darkstar has now been released, as open source software, under GPLv2!
The code is available from the ‘Downloads’ section at http://www.projectdarkstar.com .
Project Darkstar is the video game industry’s first enterprise grade, high performance, fault tolerant and highly scalable server technology for online, multiplayer games. Project Darkstar has been designed from the ground up to handle almost any kind of online game imaginable.
Project Darkstar is used along with Project Wonderland in Sun’s MPK20 virtual workplace world.