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With D3.js developers can produce dynamic, interactive data visualizations in web browsers.  It's a free and opne-source JavaScript library that combines Scalable Vector Graphics, HTML5, and Cascading Style Sheets standards. The library gives developers the full capability of modern browsers and puts a strong emphasis on web standards.

Plotly provides a frontend for data visualization used for machine learning and data science models. With Ploty you can

Matplotlib is a free and open-source data visualization library for Python. With Matplotlib you can vizualize data in plots, charts, histograms and much more.

Giving you the knowledge you need to make better decisions. Kissmetrics is a revolutionary person-based analytics platform for your whole team. Get product, sales, marketing, customer support working together to improve the metrics that matter.

Clicky Web Analytics is a simple way to monitor, analyze, and react to your blog or web site's traffic in real time.

Analytics for web and iOS. Heap automatically captures every user action in your app and lets you measure it all. Clicks, taps, swipes, form submissions, page views, and more.