Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.
Xmind - Xmind is a brainstorming and mind mapping application.
Dark Language - Holistic language, editor, and infra for building backends
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
adapta-gtk-theme - An adaptive Gtk+ theme based on Material Design Guidelines - adapta-project/adapta-gtk-theme
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.