Theres a site called kickstarter a site dedicated for crowdfunding , but I believe your bitcoin address is enough to start this, all you have to do is to promote it ,just like ICO coins are doing. Why look for 3rd party site?
Is there a website, forum thread or whatever that promotes crowdfunding projects?
I found some on google however I don't think none is working anymore..
I'm asking this because I have a business idea related to bitcoin, well I can try by a fiat crowfunding too however I think it's more easy to "bitcoin-people" have interest.