By accessing public data sets (including your own GitHub or Spotify data) through Qlik Associative Engine and APIs, you can experiment and create beautiful visualizations and data-driven apps using powerful search, data retrieval without writing queries, out-of-the-box charts with a single line of code and more. Free. Qlik Playground
Kaltura‘s built-in analytics and reports provide the insight you need to successfully manage content and make decisions based on real data.
Proposes a valuation based on more then 20 metrics to measure and track success of a website: http://www.websiteoutlook.com/
Useful formula to determine an exact sample size for qualitative research: https://www.smashingmagazine.com/2017/03/user-research-sample-size-data/