Thanks for replying! While similar in some aspects, CrowdFundFusion focuses on allowing users to browse crowdfunding projects from multiple sources. CrowdHub on the other hand, allows users to browse projects, up-vote, and save them in order to keep track of projects that sparked their interest. In other words, CrowdHub tries to focus more on frequent crowdfunding browsing users and providing a crowdfunding user system for them.
I took a look at Cf4all, I had yet to encounter the website before. The search system is quite commendable! One thing I noticed about the Cf4all is their use of CrowdCredits. CrowdCredits is similar to CrowdHub's up-vote system but I think having a limited number of credits and the need for the site to clarify what CrowdCredits is, might hinder or confuse some users. Asides from that, I want the ability for CrowdHub users to save projects to ultimately lead to a recommendation system that curates projects for users and bring them projects that interest them.
Great question!