BORROW Crowdfunding - funders microfinance projects in return for a small interest on the amount. E.g. Kiva, LendingClub.
CLICK or social button Crowdfunding - funders pay websites, blogs, videos, etc, through an online tool added to the page. E.g. Flattr, Kachingle
DONATION Crowdfunding - funders pledge money in return for goodies or just goodwill. E.g. Kickstarter, Indiegogo.
EQUITY Crowdfunding - funders are offered equity stake in the company in return for capital. E.g. GrowVC, Crowdcube.