If you want to just take a sneak peek at our source code you can look it here.
We are hosted on the great OpenSource Site of SourceForge, the biggest OpenSource repository in the Net.
You can find the details in the SVN section of sourceforge site. There is no prepackaged source zip, you will have to use SVN (Subversion): http://www.sf.net/projects/planeshift
There is also a PlaneShift Compiling Guide available to help you.
Open Source software is about freedom and liberty, not about price. Developers decide to create OpenSource software to give more liberty to the users and to increase sharing of information.
Giving public access to the sources, means that anyone can learn from it, and can hopefully decide to help the ones that give this information for free. All people that share this idea form the Open Source Community, a stable, big and friendly community that aims to improve the liberty of users.
With Open Source you know exactly what is running on your machine, you have a way to report and fix bugs on it, you can enhance the experience of all by helping and improving the software.
Open Source Licenses are a main part of this idea. Those licenses give maximum visibility on source to everyone, while keeping the sources safe from commercial exploits. When source code is released in that way, it belongs to the community of OS developers, any other people (including companies) can take that software and enhance it, but they will be bound to release their enhancements as OpenSource. This can really keep safe the work of the developers.
PlaneShift decided to be an OpenSource project, but introduced in its license some additional bounds to keep safe the work of our artists and to ensure project success.
To have a clear idea of our license and to understand the reasons behind it, please read this page.