Did something with freeplane once. It's a mind mapping software based on freemind and it's oss. There, you can interact with the nodes by api and groovy languag

Did something with freeplane once. It's a mind mapping software based on freemind and it's oss. There, you can interact with the nodes by api and groovy language (I think there's also an python, interpreter possible, long time no use. May be very wrong here) By that you can do whatever you think of with the nodes and leaves. There are plug-ins people use to access their email and such..