Diagrammm - Fundamentals on data visualization
Eyequant - We’ve built an artificial intelligence that instantly predicts how users will see your website so that you can create landing pages that sell
Crossfilter - Fast multidimensional filtering for coordinated views
Attention Insight - Maximize advertising campaign results and design performance with pre-launch analytics.
Sheetsee.js - Connect Google Spreadsheets and visualizing the data
Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.