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.

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!

CoffeeRun - Let everyone enter their order for coffee runs

xZeitgeist - The most popular tweets categorized and ranked, every day

TaskPaper - Plain text to-do lists for Mac