Request inspector - Debug web hooks, http clients
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!
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
Hunter TechLookup - Create lists of websites by technology for free
CurlHub.io - API Traffic Inspector
Listshare Group Lists - Easily share group lists with your family and friends