User blog comment:Rapidthehedgehog/Art Help/@comment-26530075-20150807003732

Paint Tool SAI does require a quite a lot of dollars, but there is a way to get it free. I'm bad with computers, so I had someone else do it for me, but there are a lot of YouTube and website tutorials on downloading it for free. I got no viruses or spyware. Also, another option is FireAlpaca, which is legit free for everyone to use and is almost as good as SAI, and I saw people drawing very nice art on it as well. GIMP, I'm not sure is free, but I heard it can be good, you might want to research if you're interested on this. If you want something like Photoshop(which is NOT free) then I reccomend SumoPaint. This is free, and it's pretty darn good, according to reviewers.

Although I only use SAI xD (but planning to experiment with all the legit free ones).