I just happened to release a new open source project this very christmas eve. Go For It! is a to-do list application with built-in productivity timer, that I have been working on in my spare time during the last one and a half months or so.
It has been designed with minimalism in mind, insipired by elementary OS and Gnome applications. To-do lists are stored in the Todo.txt format, which makes them easy to synchronize and maintain. The video iilustrates the application's workflow and functionality.
I wish you all a merry Christmas!