Product Recommendations AI - Personalized software recommendations based on your stack
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.
Depict.ai - Amazon-quality product recommendations for any online store
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!
Suto - Get one-on-one expert product recommendations.
xZeitgeist - The most popular tweets categorized and ranked, every day