jsxgraph software package provides Interactive Geometry with JavaScript, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install jsxgraph
jsxgraph is installed in your system.
Make ensure the jsxgraph package were installed using the commands given below,
$ sudo dpkg-query -l | grep jsxgraph *
You will get with jsxgraph package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Development |
| Package | jsxgraph |
| Version | 0.98~dfsg1-3 |
| Description | Interactive Geometry with JavaScript |
| Sub Section | Devel |