JFreeChart!

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 uses, including web scripting and integration as a plotting engine for third-party applications like Octave. Gnuplot supports many types of plots in either 2D and 3D. It can draw using lines, points, boxes, contours, vector fields, surfaces, and various associated text. It also supports various specialized plot types. »

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®†), web application servers, and six graphical user interface toolkits.

Dash Reports is a versatile and light weight reporting solution. It allows users and administrators to create a large range of reports driven by SQL databases.

XChart is a light-weight Java library for plotting data. Its focus is on simplicity and ease-of-use, but offers a rich set of features. The jar is only ~86 KB and it has no dependencies. It's licensed under Apache 2.0 and is hosted on Github.

Technical graphing and data analysis for Macintosh and Windows. IGOR Pro creates publication quality scientific graphics used by scientists and engineers around the world. IGOR Pro 6 is an extraordinarily powerful and extensible scientific graphing, data analysis, image processing and programming software tool for scientists and engineers.

Autograph is a dynamic PC program operating in 3 modes:

Is a powerful, easy-to-use, equation plotter with numerical and calculus features: