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.
Checkly - Fresh API monitoring and Site Transaction Monitoring. From one great dashboard.
Siftery - Share products your company uses and get personalized recommendations
Listy Beta - The things you love, privately saved and beautifully listed
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!
Checklist Generator - Create checklists for free and host them wherever you want.