Task List - Personal task manager and to-do list app for iPhone and iPad
adapta-gtk-theme - An adaptive Gtk+ theme based on Material Design Guidelines - adapta-project/adapta-gtk-theme
Habitify - The easiest way to keep track of your habits
Materia - Materia is a development environment to build advanced mobile and web applications.
Capsicum by Illuminated Bits - Plan your day. Track your habits. Tell your story.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.