Is a web program to create Logos.
Open source graficprogram GIMP
similar to photoshop, for all Operatings Systems.
DeviantART - Brushes for Gimp
Brushes for Gimp, lots of them are free to download.
Its a free software for 3d from SL Resident Cel Edman.
available for Windows, Linux & OS.
Blender is the free open source 3D content creation suite, available for all major operating systems