Analytics
You can't (accurately) improve things you can't measure. From Mixpanel to Google Analytics, there are all kinds of tools to make sure you're on track.
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Only API (probably with JSON) Web
Experience a web interface built with API (and JSON) only


Pendium
A time & finance tracking tool for collaborating freelancers



MakerLead
Find top 100 open startups with verified monthly revenue



Site Recording
Visitor tracking & behavior analytics software

UserExperior
Identify, Analyze & Fix UX issues in Mobile Apps



