Apps with 'pie-chart' feature

Analytics for programmers using open-source text editor plugins. The service itself is not open source, only the plugins.

Pygal is a dynamic SVG charting library written in Python.

Chart is a plugin for Sketch, Figma, and Adobe XD. Try Chart to save yourself hours of manual, tedious work, and create a graph with real or random data in seconds. It's easy to make, edit, and customize different types of graphs.

Flexible, cross-platform and cross-browser JavaScript (HTML5) charting library that allows you to create interactive bar, pie, line, spline, area, Gantt, stock and other charts, maps and dashboards, with real-time updates and multi-level drill-downs.

Koolcharts provides charting solutions with full HTML5 support. It renders data using a number of sliding effects, you can choose whichever effect you want and set an amount of time for a sliding effect.

Clacos is a multilingual service for creating simplified dashboards. The main goal is to follow the activity of your company.

diskreport.net allow to generate an online report of disk space usage. Periodic run allow reports of size and file count variation, usefull to find growing files or directory.