JAVA graphs & charts libraries
Hi! I'm working on an app that requires a lot of graphs and charts. We are at the beginning so we are still looking for some nice libraries that can be integrated easily but in the same time, flexible. If anybody knows some of these libraries, please post some names and/of links. I already found some of them but I prefer to get some advices from more experienced users @ this. Please consider mentioning all that you know opensource/free/commercial.
Thank you in advance for those which will respond.