PSPP is a free software application for analysis of sampled data, intended as a free alternative for IBM SPSS Statistics.

PanXpan helps companies make the most of their internal business data.

GraphCalc is an open source software for Windows and Linux that provides the functionality of a graphing calculator.

Graph is an open source application used to draw mathematical graphs in a coordinate system.

Desmos is an online graph plotting app.

Observium is a low-maintenance auto-discovering network monitoring platform supporting a wide range of device types, platforms and operating systems, etc.

Cacti is a network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality.

LibreNMS is an auto-discovering PHP/MySQL-based network monitoring system.

Origin is the data analysis and graphing software.