What are some alternatives?
When comparing Mind Map by RealtimeBoard and adapta-gtk-theme, you can also consider the following products
Whimsical Mind Maps - Fast & beautiful mind maps with real-time collaboration
Moka - Moka is a Gnome Shell theme that uses simple geometry & basic colouring.
Atina - Simple project management tool
Materia - Materia is a development environment to build advanced mobile and web applications.
productboard - Beautiful and powerful product management.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.