Recently, I've been working on this program which parses and graphically represents user log events from Condor log files. Because it is part of the Condor project, the source code is unavailable but hopefully the program will be made available upon completion to Condor users. Here is a picture of it (as of March '99). A demo version can be run as an applet if your browser is so enabled, and you have java2 installed. Give it a try by clicking here or on the below image, or take a look at the API, or download the jar file.
I can make available the source code for the below program which is the first gui (graphical user interace) program I wrote. This program downloads an html document, parses it and displays usage statistics of the Unix lab machines here at UW-Madison (for fun it has a scribble class and a bouncey class):
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Linux
users can download jdk at blackdown 
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Actually, if you download anything, send me an email. It's nice to know where this stuff goes.