What are some alternatives?
When comparing Mind Map by RealtimeBoard and Iris, 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.
Hassl - A really great project management app
adapta-gtk-theme - An adaptive Gtk+ theme based on Material Design Guidelines - adapta-project/adapta-gtk-theme