Comment on Hells Gate by thaOman

yea just google some space brushes could be stars dust, here are some links that could help:

for planets, textures and brushes...
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[link] ( go to freebies they have a LOT!)

Software;
best fractal out there (in my POV) Apophysis.org
Painting could be MyPaint or PaintTool SAI they are one of the greatest one out there if you cant afford PS
for Terraspace you can use Terragen ([link])
for 3D modeling i would use Blender ( in my POV i hate it! lol worst learning interface ever, but hey its free!)
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Tutorials;
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lol if you gat any questions just ask, happy to help... keep experimenting!!!! a good website to find alternatives for a software is ([link])
you can also go to the groups you are interested in, they can have tuts and their steps on how they did their art. hope it was of help