The Astrophysics Source Code Library is a free on-line reference library of astrophysical source codes used to generate results published in or submitted to a refereed journal. The library housed on the discussion forum for Astronomy Picture of the Day (APOD) at http://asterisk.apod.com/viewforum.php?f=35.
Front Page of the ASCL Forum
The library cites three main benefits to astronomers:
“1. Increased Falsifiability
2. Increased Communication
3. Increased Utility
To date, over 200 codes have been added to the libary, which provides a description of each code, and links to the source and papers describing it. The library also provides links to a very helpful list of software engineering papers that will be of interest to astronomy developers.
Disclosure: I am a member of the ASCL Advisory Board.