Cube in OBJ format.  With UV mappings for texture
Here is the source code:

mtllib cube_texture.mtl 
g cube
usemtl blinn1SG

v  0.0  0.0  0.0
v  0.0  0.0  1.0
v  0.0  1.0  0.0
v  0.0  1.0  1.0
v  1.0  0.0  0.0
v  1.0  0.0  1.0
v  1.0  1.0  0.0
v  1.0  1.0  1.0

vn  0.0  0.0  1.0
vn  0.0  0.0 -1.0
vn  0.0  1.0  0.0
vn  0.0 -1.0  0.0
vn  1.0  0.0  0.0
vn -1.0  0.0  0.0

vt 0.0 0.0
vt 1.0 0.0
vt 1.0 1.0
vt 0.0 1.0
 
f  1/1/2  7/3/2  5/2/2
f  1/1/2  3/4/2  7/3/2 
f  1/1/6  4/3/6  3/4/6 
f  1/1/6  2/2/6  4/3/6 
f  3/1/3  8/3/3  7/4/3 
f  3/1/3  4/2/3  8/3/3 
f  5/2/5  7/3/5  8/4/5 
f  5/2/5  8/4/5  6/1/5 
f  1/1/4  5/2/4  6/3/4 
f  1/1/4  6/3/4  2/4/4 
f  2/1/1  6/2/1  8/3/1 
f  2/1/1  8/3/1  4/4/1 

Notes:
v - vertices in x,y,z coordinates
vn - normals
vt - texture in u,v coordinates
f - faces, which map vertices, UVs, and normals on to each other