WSN Software Directory comes with the option of installing 60,000+ software listings from the official PAD file repository. Just select this from the pre-load data options during setup.

If you'd like to replace the current listings on your site with a new default dataset, you can do this by following these steps:
1) Bulk-delete your current data by doing to Admin Panel -> Miscellenous -> Advanced Options and running the queries
TRUNCATE TABLE {PREFIX}categories;
TRUNCATE TABLE {PREFIX}links;
TRUNCATE TABLE {PREFIX}comments;
TRUNCATE TABLE {PREFIX}ratings;
in the run SQL queries box.
2) Go to yourwsnurl/admin/loaddata.php?filled=1&datasource[0]=padlistings&dataindex=0 and let that run to conclusion (will take a few hours).