Free drawing programs

From http://giovannuzza.tumblr.com/

*= available for both windows and mac os
GIMP * - Does a lot of the same stuff as Photoshop.
FireAlpaca * - Similar to Paint Tool Sai, so it’s a good alternative for Mac users.
Autodesk Sketchbook Copic Edition * - Simulates the look of copic markers.
MyPaint * - Basic stuff, nothing fancy.
Pinta * - Drawing program modeled after paint.NET.
Inkscape * - Vector/drawing program meant to be similar to Illustrator.
ArtRage * - Digital painting program; you can get the trimmed down version for free or buy the full version with more features.
Sumo Paint * - In-browser drawing app.
DAZ Studio * - Some sort of 3D model poser thing.
Pencil * - Software for animating.
SketchUp * - Tool for making 3D models. Looks handy for stuff like architectural drawings.
Blender * - Pretty popular 3D software.
escape motions * - Some browser apps, fun to fiddle with when you’re bored (the fluid fire simulation is pretty cool imo).
Twistedbrush (Pixarra) - Seems to be meant for replicating the look of traditional media.
Pixia/Phierha - A popular program in Japan, according to the website.
Krita - This was originally made for Linux and it looks like the developers haven’t ironed out all of the kinks in the Windows installer.
Artweaver - Another trimmed down free thing if you don’t want to buy the full program.
paint.NET - Pretty basic kit, probably good for simple stuff.
Project Dogwaffle - I’m not sure what this one is all about because I couldn’t stop laughing at the terrible website.
Speedy Painter - Lightweight digital painting program.
mtPaint - Originally made for pixel art; simple enough to run on older computers.
Chasys Draw IES - Supposed to be some sort of drawing+image editor thing.
PaintRibbon - Seems to be another plain old basic image editor.
DrawPlus - Looks like it’s made for graphic design and vector stuff.
SmoothDraw - I’m guessing this is a basic thing for people who don’t want to bother with complicated stuff.