Hunter TechLookup - Create lists of websites by technology for free
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Upscribe - Embeddable lead generation forms for Medium
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!
PingPoint - Never miss a Mark Zuckerberg signup to your app ever again