Resolved Mind-mapping without java?

Of course there is. You can write those kinds of apps in any general purpose programming language you like. It just appears that most programmers have chosen to go with Java for this.

Nothing is stopping you from writing one in your language of choice though if there isn't an open source one available in said language.

Do you have a particular language in mind?

 

Because of the promised independence of hosting environment (not always a good thing).
ObjectiveC would tie you to (i)OS(X). Not particularly a bad thing.

 

It would increase your work but you can easy define your own controls and react on events yourself.

You might end up not using the interface builder at all but do the GUI fully in code; that what I do mostly anyway.

I would still create the own controls on UI* base classes but inherit some functionality (events like gestures) but finally you could go down to CoreAnimation and do lot yourself.

 

Just have now a very old bookmark/sample of custom control handy. This one is not good anymore as you could control the round corners now easy with properties. It still would be helpful if you want inserted round corners and to see the idea behind...

http://iphonedevelopment.blogspot.jp/2008/11/creating-transparent-uiviews-rounded.html

Method drawRect is key here.

I think the documentation give tutorials on customer drawing function; I don't have access right now. I try to find more hint when I'm back home

 

Yup, in case you want iOS and OS X just watch out in little details; but a good start