Startup Toolkit - Interactive how-to guides to launch your startup

Stackshare - StackShare is a comprehensive website that gives its users the chance to organize and share their technology stack with the rest of the community.

Toolbird - Discover online tools that other startups use

Techmap.io - Techmap is a workplace search engine to find companies using technologies (e.g., Rails, PHP, Java, etc.) that are used internally. Finally, a "Google for Workplaces" that helps people find a place to work with technologies they love!

Techstars Entrepreneur's Toolkit - Online resource to help you learn about entrepreneurship

WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.