I have been looking out for a good productivity tool such as to-do manager and Note taking software. I had tried Asana and Evernote, while they were good but they forced me to think in a certain manner with their interface. Incidentally I started to learn programming and took on emacs for coding. While exploring the million (literally million) ways of configuring emacs, I came across org-mode and it was beautiful. It's beauty lies in its simplicity. Just have a look at it and decide for yourself.