Habitify - The easiest way to keep track of your habits
Flux - Application Architecture for Building User Interfaces
Capsicum by Illuminated Bits - Plan your day. Track your habits. Tell your story.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.
Todoist 10 for iOS - A completely new Todoist for iOS