OpenSolaris's an open source operating system based on Sun Microsystems' Solaris. It's also the name of the project initiated by Sun to build a developer and user community around it. OpenSolaris's derived from the Unix System V Release 4 codebase, with significant modifications made by Sun since it bought the rights to that code in 1994. It's the only open source System V derivative available. Open sourced components are snapshots of the latest Solaris release under development. Sun has announ… (More on Opensolaris)