What the title says....

Never heard of them

I know what a freelance means but I have no idea what freelance sites could be...

Ok, so whats freelance anyway?

freelance

-A person who sells services to employers without a long-term commitment to any of them.
-An uncommitted independent, as in politics or social life.
-A medieval mercenary.

v. free?lanced, free?lanc?ing, free?lanc?es
v. intr.
To work as a freelance: a journalist who freelances.

v. tr.
To produce and sell as a freelance: freelanced the article to a magazine publisher.

adj.
Of, relating to, or working as a freelance.

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ie. I'm a freelance model which means I promote myself and don't work for a modeling agency thus I don't have to pay any % cut to anyone.