Links to free online image and photo editors.
Special effects, itemized by function
Some of these programs have better features than others. I cant really say there's one that does everything or one that does everything well. So, here are selected functions with several examples of each that seem reasonable.
HTML, CSS bits and pieces.
Online art and graphics programs for altering pictures or making buttons, banners and the like.
These are things where you can put your own text or picture into a pre-existing graphic. Most are just for yucks, some are halfway serious tools.
These resources either generate tons of text or do graphics kinda stuff to letters.