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I want to make a duplicate of Presentz.org for my site. This is legal since the entire source code used to make the site has been released by them as an open source project and they want people to use it without any limitations.
Also they use orient database but it works fine with mysql code and works on all types of servers since it's based on the java language. Anyways, you can go to the site, presentz.org and download the entire source files for that site here:
It's sectioned out by categories so they have the master files grouped together, the server side files grouped together, and the editor files grouped together, etc. Play around with it and if you think you can create a functioning duplicate of the site using the scripts they give you then bid on this project.