I'm not an artist but I like coloring line arts.
My primary operating system is Ubuntu(Linux).
www.ubuntu.com/I use gimp
www.gimp.org/ to color stuff.
I may also try other programs in the future like Krita
www.krita.org/index.php , MyPaint
mypaint.intilinux.com/ , and Pixia/Phierha
www.ne.jp/asahi/mighty/knight/.
I sometimes use Inkscape
inkscape.org/ to expand smaller linearts.
If you have any advice, pointers, tips, hints, suggestions, ideas, criticism(constructive), or any other way of letting me know of ways I can improve, feel free to do so.
Except for one other picture I did a long time ago, the pictures posted are the first ones I've ever colored.