to go straight to the Blender page to find tones of stuff from novice to pro its all there.
What is Blender?
Blender is the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for all major operating systems under the GNU General Public License. What is Yafray?
YafRay is a powerful raytracer, under the LGPL license. It enables you to create fantastic images and animations of a photo realistic quality. Below can you find the most relevant features which YafRay offers.
What is open source?
Definitions of Open Source Software on the Web: Open Source Software is software for which the underlying programming code is available to the users so that they may read it, make changes to it, and build new versions of the software incorporating their changes. There are many types of Open Source Software, mainly differing in the licensing term under which (altered) copies of the source code may (or must be) redistributed. domainsmagazine.com/managearticle.asp Open source software allows for anyone with programming experience to revise and change the programming code to suit their individual needs. It allows you to fully customize your settings. Many of today's popular software programs once started as an open source software program. For example: Linux, Firefox and many more. www.intensedevelopment.net/website-design-O.html A program in which the source code is available to the general public for use and/or modification from its original design free of charge, ie, open. Open source code is typically created as a collaborative effort in which programmers improve upon the code and share the changes within the community. www.jahadesign.com/glossary.htm Free programs created through the collaborative efforts of programmers from around the world www.metromemetics.com/thelexicon/o.asp Software that shipped with its source code, and that subject to the nine policies of the Open Source Organisation starlab.es/hosting/win/documents/glossary_1_va.html Open source denotes that the origins of a product are publicly accessible in part or in whole. en.wikipedia.org/wiki/Open_Source_Software
