It wasn’t that long ago when if interested in crowdfunding, you only had a handful of platforms to choose from. There were the 2 big ones: kickstarter and indiegogo and it almost seems like overnight the number of platforms has exploded. Inc magazine had recently a very interesting list and map of options depending on what you are trying to do: build a company, build an app, work on a science related project, etc.
I am sure by the time you read the full article, the list will already be obsolete, but it can give you a pretty good idea about the different options available. Read Inc Magazine’s article for the full list of 22 crowdfunding sites.