Here are some programs you may want to consider

With the quality of story growing ever better in RG, the desire for representative art has increased substantially recently. So here is a list of free programs you may want to consider, as each can be quite useful for RG.

GIMP - A free digital art and photo manipulation program, very similar to Photoshop.
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Sculptris - A 3D modeling program used to make cool game meshes. This one is VERY helpful when it comes to designing aliens for RG.
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Blender - A free animation software for game makers and animators. It can make movies, games, etc. Though like most animation programs, Blender is immensely complicated, so beware.
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Anyone who has any others to add to the list may post them below.