I am familiar with GTD applications for Mac OS X, such as Things, the Hit List, etc. However, I'm trying to find a GTD application that I can use across different OS.
One main feature I would like to have is real-time synchronization. If I update on my macbook, I want to see it updated for the app on Windows. Is there a such application?
So far, I was able to find ones that don't have this real-time synchronization across different operating systems.