I am looking for a plugin/themes manager that users will be submitting. Pretty much I would like to have something like these:
migrated from webapps.stackexchange.com Mar 1 '11 at 16:11
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I'm not sure if there's anything that won't take any time at all to set up but you could put something together quickly using Drupal without needing to write any additional code.
There's also a module for Joomla called DOCman that appears to be similar to what you want but I don't currently use Joomla myself so can't recommend it's suitability.