Resources that caught my eye but are as of yet unsorted for any particular purpose.

The resources in here are meant to be sorted into collections. As of yet, I've only created a few such collections to sort them into, so you might check there for those sorts of resources:

Backgrounds

Fonts 

Icons

Only licenses you'll find in here should be:

CC0
CC-BY 3.0
CC-BY 4.0
OGA-BY 3.0

These were chosen due to complications with sharealike requirements and complications with the GPL/LGPL for commercial development.

Here is a link to that search to help myself: link

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).