Salam Anak IT.
Today's FOSS (Free and Open Source Software) will be Blender.
No... Not THAT blender... But THIS Blender...
Based from their offcial website, "Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License".
For those who are already familiar with 3DMaxStudio, Maya 3D, Cinema 4D, you might want to try this out.
Here are some Blender's screenshot examples:
There are some short good movies created with Blender. One of them is Big Buck Bunny. I also found a good trailer here.
Looks realistic? Again created with Blender. More at Blender Art Gallery.
Download Blender now here and see if you can think in X,Y and Z axises =) enjoy~