But MindNode would not satisfy the cross-platform preference of the OP if by cross-platform he means OS X and Windows rather than OS X and iOS.
Personally, I have not used any for a significant length of time but had a brief search for cross-platform mind-managers a while back.
For desktop apps available on Mac & Windows, I believe the most popular ones are Mindjet MindManager, Xmind, and Freemind.
There is also Mindjet Connect and MindMeister web-based mindmanagers (I think both have offline editing modes and mobile apps).