CCBY Nature
Curated collection for use by the "Thank You Project", an internal suite used by Byzantine Cat Productions and friends.
The "Thank You Project" is a series of tools and scripts used to fetch, convert, sort, and keep track of the credits and licences for free art and music resources for games made with Unity3d.
The tools are currently under development and not available to the public (though they may be at a later date).
OpenGameArt.org can automatically generate a single credits file for all of the art in this collection. Please note that, while we tried our best, this file is in no way guaranteed to be accurate, and properly attributing the work you distribute with your project remains your responsibility. You'll want to load up this file in a text editor, check to make sure everything looks good (and that any special attribution instructions are followed), and then delete the notice at the top of the file, as the notice is designed to make you look very silly if you don't check over the file and remove it.