I found this great cross platform software that works on everyone now, and is something everyone should invest some time downloading and using from time to time.
I came across NaDa while reading a blog somewhere, and it has proved to be a great new concept for productivity, and gives a new approach to software design!
So check it out over here, best of all NaDa is free and as I said before, now works on all operating systems.
I give it 4/5 stars