Barbecue is a Java library that enables the creation of barcodes in a variety of standard formats that can be displayed as Swing/AWT components, included in printed output, generated as EPS and SVG and displayed in a web application.
A Java application/library that can generate PNG tile overlay images for Google Maps from multiple data sources. Inactive because there are better alternatives: Java - http://geotools.codehaus.org/ PHP - http://www.mapserver.org/