Comix:

• Bellum Pulchrum
• Fairmeadow

Friendos:

• Otters
• missingquery

da Fun Zone:

• Simon Tatham's Portable Puzzle Collection
• Kid Pix Real

Toolbox:

• Text Colour Fader (y'know like for tumblr posts)

Do a Learn:

• "How to Think when you Draw" Tutorials
• Cool Guides for Cool Kids

Free (and other) Shit

• Font Squirrel
• Public Domain Image Archive
• picryl (more public domain images)
• rawpixel (public domain section)

References and stuff for doing Art:

• Database of Dimensioned Drawings
• Animal Photo References dot Com