SlateBox – Collaborate from Anywhere
https://slatebox.com/

Meet Slatebox: the free and open collaboration canvas. Collaborative Kanban, Daily Standup, Mind-maps, and more — with a growing library of templates, Slatebox has your use case covered. Slates are approachable and powerful. Every member of your team can start building instantly, easily learning as they create. Written from the ground up for instant, real-time collaboration, Slates are instant, multi-cursor canvases with tons of playful customization.  Themes let you style any Slate instantly; templates provide specific functionality. And anyone can build either!