The Astrophysics Source Code Library

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

Perhaps a crucial error was made in the coding of a sound idea. ASCL presents a way for authors to bolster their results by demonstrating the integrity of their source code(s). Conversely, ASCL presents a way for readers to bolster their confidence in published results by checking details of the source code(s).

2. Increased Communication

Perhaps an author finds it difficult to describe completely in the text of a paper how the results were obtained. ASCL creates a way for authors to present more detailed information about how their computations were carried out.

3. Increased Utility

Perhaps an author has created a code that (s)he feels is itself useful to other astrophysicists. ASCL creates a way for these authors to disseminate a source code of significant utility to astrophysicists”

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.