Viable Fit - Measure and improve your product market fit
Flare by GoDaddy - Discover, give feedback and support startup ideas
Product Fit - Measure product/market fit in app with your users.
Wittycircle - Networking tool for entrepreneurs, makers and curious minds.
Product/Market Fit Survey - Check how close your product is to Product/Market fit
Generating Product Ideas - Find ideas for your next business or side project