ClassFinder - Java library and stand-alone Swing application that helps in finding individual resources in a predefined classpath made of .jar and/or .zip files (similar to Ctrl+Shift+R keyboard shortcut in Eclipse)
API javadocs found here: http://jorgeb1980.github.io/ClassFinder/mvn-site/apidocs/
Latest binary at https://github.com/jorgeb1980/ClassFinder/releases/latest