Have a look at Metabase. It's open source, web based and runs from a single JAR. Not the same as a full fledged management tool of course, but I like it for s

Have a look at Metabase. It's open source, web based and runs from a single JAR. Not the same as a full fledged management tool of course, but I like it for simple queries and charts and the price! DbVisualizer also has built in charts that are simple but... not free/open source.