Those who have joined the cult of David Allen’s Getting Things Done (GTD) methodology, of which I am but a humble and inexpert practitioner, might be interested in ThinkingRock. This is perhaps the best implementation of the concepts that I’ve come across so far. It’s Java, so will work on Mac, Windows or Linux, and is free, though they welcome donations.
If you don’t know GTD, it will be somewhat mysterious, until you’ve read the book or listened to the audiobook.
Thanks for a great link. Was just in the middle of re-reading the book to get myself back on track.
Many thanks for pointing out the book Getting Things Done. I found the book immensely useful and have found the software invaluable.