BuiltWith Toolbar - Reveals the tech underneath a website. Browser extension.
Product Market Fit Toolkit - Measure your product-market fit using data you already have
Spokk - Get your creations or ideas for blogs, designs, art, music, photos, YouTube videos or anything...
Viable Fit - Measure and improve your product market fit
botwick - Build your own SMS-based text bot
FaqFox - Find the questions your target audience is talking about