Php Motion is a free clone that emules the websites such as Youtube with all the functionalities needed. With this script, the users can upload videos from their computers and also play and watch any video found in your PHP Motion based website. The script also allows you to create categories for the different videos.

And what happens with the design of your Youtube clone?
Don´t worry, there are a lot of themes that change the general appearance of your website. You can get this with just one click from your administration panel. By the way, you can also easily modify the CSS stylesheets to your needs.

You can download the script here, and see a demo here.