jgraph is an elegant little tool which accepts script files, that describe a picture, and generates .eps files out of them. The resulting picture is of high quality, that can go into books and journal articles - much better than the ugly crud we normally get out of spreadsheets.
The documentation of jgraph is found in it's man page. Say
man jgraph to access it. However, once you have a nodding
familiarity with the manual, the examples on this page are quite useful.
Just in case, the commands needed to turn a .jgr into a .eps and a .pdf are:
$ jgraph a.jgr > a.eps
$ epstopdf a.eps
$ ls -al a.{jgr,eps,pdf}
It is easy to encode these into a Makefile, so that make will automatically look at a most-recently modified .jgr file and recreate the .eps or .pdf files as needed.
If you are using a graphics mode WWW browser, you will see many pictures. Click on any picture to see the jgraph which generated it. If you are not in graphics mode, you will see a string like "Example 0". Click on it to see the jgraph.
Ajay Shah, 2001