A very good resource.
http://www.haghish.com/statistics/stata-blog/stata-programming/ssc_stata_package_list.php
"This archive includes the complete list of user-written Stata packages till January 1st 2015 and includes a brief description and HTML help file. This archive has been created for education purpose (not for installing packages!), particularly for those who wish to find interesting packages or study a user-written package as quick as a mouse click. The archive includes several useful features such as providing HTML help files as well as categories that indicate what kind of Stata programming files (ado, mata, plugin, dlg, tut, scheme, style) are included in each package. In addition, literate package - packages that comment the procedure and structure of the ado files - are specified with a red circle and are excellent materials for learning/improving Stata programming."