Freelancer Directory - Find freelance jobs and collaborators with no fees. Forever.
Hunter TechLookup - Create lists of websites by technology for free
Reddit List - Tracking the top 5000 subreddits
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!
Flexiple - Flexiple helps companies work with top tech talent within 48 hours to 7 days. Our talent are handpicked through a rigorous screening process and are alumni from top tech companies such as Amazon, Adobe, Microsoft, amongst others.
xZeitgeist - The most popular tweets categorized and ranked, every day