Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
Startup Toolkit - Interactive how-to guides to launch your startup
Twik - Twik automatically personalizes websites to increase conversions.
Techstars Entrepreneur's Toolkit - Online resource to help you learn about entrepreneurship
Justuno - Intelligent lead captures, personalized website messaging, and audience analytics to convert more visitors into customers.
AwesomeHunt - Community-curated lists of learning resources on any topic.