Tinderbox has been very proud of its mapping features. That feature is indeed the main selling point of the application. But, I just realize, one doesn’t need to go through the pain of learning an application as complex as Tinderbox to gain these benefits. A little sister of Scrivener, Scapple can do it the mapping of ideas with the smallest fraction of cost; with the easiest pace of learning. It is also better than mind mapping applications mainly because it is portable (that is, you can just drag your notes to Scrivener), and the rigid outlining forced in the mind mapping applications doesn’t exist in Scapple. It is just free, a clean piece of paper. Write, connect in a way you want your ideas to flow.
Go and try it. You don’t have to worry about learning a complex, arcane piece of software to graph your ideas.
Dellu 
iThoughts added concept mapping and process mapping only in the past few days. Previously it could only do mind maps with a few kludges to “side-link” items. Unlike Scapple, it has both OS X and iOS apps.
Glad to see you’re posting again. I added your feed to my feedreader shortly before you went silent in 2014. 😦
Best regards,
Robert
Interesting, I will check iThoughts. Yah, I have tried it once on my mac. But, I never really used it.
Yes, I went to Africa for a year.