Blender Splash Screens

Blender 2.77 - Racing Car

By Pokedstudio. (CC-BY-SA, 20 MB). Note: actual splash was post-processed with Depth of Field.

Blender 2.74 - Fishy Cat

Fishy Cat, by Manu Jarvinen (manujarvinen.com) (CC0, 32 MB)

Cycles tests

BMW Benchmark

The famous BMW benchmark from Mike Pan. (CC0, 3 MB)

2.74 Demo Files

A collection of simple files with examples of Cycles renders. (CC0, 21 MB)

Class room

By Christophe Seux, maker of short film "Deconcerto". (CC0, 72 MB)

Barcelona Pavillion

High quality archviz demo from eMirage. (CC-BY, 24 MB)

Realtime graphics

BMW Viewport

Another famous BMW benchmark from Mike Pan. (CC0, 7 MB)

Levi

High poly character, by Yusuf Umar. (CC0, 13 MB)

Rendering & Cartoons

Freestyle render

ATV buggy by Rylan Wrigh. (CC BY, I MB)