The first part of the Solaris code base to be open sourced was the Solaris Dynamic Tracing facility (commonly known as DTrace), a tool that aids in the analysis, debugging, and tuning of applications and systems. DTrace was released under the CDDL on January 25, 2005, on the newly launched "opensolaris.org" website. The bulk of the Solaris system code was released on June 14, 2005. There remains some system code that is not open sourced, and is available only as pre-compiled binary files.