GT3 Sport Case
 

The GT3 Sport Case is a small form factor case created by the folks at
GTR Tech Corporation. However, this isn't your every day small form
factor (SFF) case. One of the big limits they have removed is the fact
that you have to use a limited motherboard or a MicroATX board. They
have opened up the motherboard tray to the standard 12” x 9.5” ATX
motherboard size. So you now have the option of using full size
components typically found in mid or full sized cases in a SFF case.

http://www.gideontech.com/content/articles/356/1