The best free alternative to GnuPlot is GNU Octave, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to GnuPlot and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to GnuPlot are GeoGebra (Free, Open Source), Matplotlib (Free, Open Source), Desmos (Free) and Microsoft Mathematics (Free).
Timeplotters are command-line tools for visualizing temporal data, especially useful for visualizing data from ad-hoc program logs to help you spot patterns and anomalies that you would not spot otherwise (by just watching how the program works, or by looking at the logs with...
The Mandela is a Windows application that helps in the diagnosis of performance problems in Linux and Oracle databases. It is able to connect to technology, read performance metrics and generate graphics on the timeline.
Is a powerful, easy-to-use, equation plotter with numerical and calculus features: Win32 screen shot. Graph Cartesian functions, relations, and inequalities, plus polar, parametric, and ordinary differential equations. Up to 999 graphs on screen at once.