Here's a page I found that may be of interest to illustrators (and others) who need software: 100 Awesome Open Source Tools.
Although the page talks about writers and bloggers, it also has links to free, open-source graphic and Web design programs. "Gimp," for instance, does basically anything Photoshop can do.
"Open source," of course, means these programs are entirely legal to share and distribute.
I hope this is useful to somebody.