DesignContestScript
New Version 2.0 Features Highlight:
Blind Contest, Featured Contest, Launch Contest Without Pre-registration, Custom Field for Contest's Brief, SEF URLs, and more.
DesignContestScript is a PHP script to create a logo and design contest website where designers can meet clients who need logos and designs created.
It's 99designs.com clone with some twists, you may want to check out the script features or try the demo.
Version 2.0 even comes with lower price option!