The Astrophysics Source Code Library (ASCL) is a free, on-line reference library for source codes of all sizes that are of interest to astrophysicists. All ASCL source codes have been used to generate results published in or submitted to a refereed journal. No ASCL code is guaranteed to be correct.
ASCL was founded in March 1999. In 2010, it was moved from its former site at ASCL.net to its current home. Source codes are increasingly important for the advancement of science in general and astrophysics in particular.