GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching. It has received several educational software awards in Europe and the USA.
Gnuplot is a portable command-line driven interactive data and function plotting utility. It was originally intended as to allow scientists and students to visualize mathematical functions and data. It does this job pretty well, but has grown to support many non-interactive...
matplotlib is a python 2D plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms. matplotlib can be used in python scripts, the python and ipython shell (ala MATLAB®* or Mathematica®†)...
Graph is an open source application used to draw mathematical graphs in a coordinate system. Anyone who wants to draw graphs of functions will find this program useful. The program makes it very easy to visualize a function and paste it into another program.
latest version is 4.4.2 (2013)https://sourceforge.net/projects/graph/files/Graph/
Python(x,y) is a free scientific and engineering development software for numerical computations, data analysis and data visualization based on Python programming language, Qt graphical user interfaces and .
The project seems no longer developed. Last version, 188.8.131.52, released in June 2015, can be still downloaded from the official website.
Data analysis and graphing software for scientists and engineers. It provides You with dozens of functionalities and options. The plotting engine is very effective and the plots are of high quality. A lot of statistical functionalities make data analysis very easy even for those...
OmniGraphSketcher helps you make elegant and precise graphs in seconds, whether you have specific data to visualize or you just have a concept to explain. Specifically designed for reports, presentations, and problem sets where you need to produce sharp-looking graphs on the...
Discontinued but open sourced @ https://github.com/graphsketcher/GraphSketcher