xfig – XWindows vector drawing program
A menu-driven tool that allows the user to draw and manipulate objects interactively in an X window. Generates pictures for PostScript and a variety of other formats (e.g. for inclusion in LaTeX documents).
BSD Style License
graphics generator whose output is good for use with TeX
Maybe you are interested in the following packages as well.
- epix: Utility for mathematically accurate, camera quality plots and line figures
- grapher: Create graphs, state machine and data flow diagrams
- gnuplot: General purpose plotting program
- metaobj: METAPOST package providing high-level objects