There are many crowdfunding platforms, each with different funding models and requirements. It's important to research and choose one that's best for your business, project or venture.
Kickstarter is a funding platform for creative projects.
Indiegogo is a funding website for nearly any kind of idea, business or project.
Back Her Business, a joint intiative from Crowdfunder and Ulster Bank, is a funding platform for female entrepreneurs. The crowdfunding is available via time limited competitions taking place throughout the year.
Read NESTA (National Endowment for Science, Technology and the Arts) guidance on other crowdfunding platforms.