FigJam

Figma's collaborative whiteboard, often used by teams who already prototype in Figma for workshops and mapping.

Good for questions like

This is Service Design Doing method library
The free online companion to the book: over fifty methods for research, ideation, prototyping and facilitation, each with a step-by-step description.
Global Service Jam
A volunteer-run weekend where people in cities around the world prototype new services around a shared theme. No experience needed.
Miro
Online whiteboard used widely for journey maps, blueprints and remote workshops, with a large library of service design templates.
Service Design Tools
An open collection of communication tools and methods for designing services, started by Roberta Tassi and maintained as a shared library.
Systemic Design Framework
The Design Council's evolution of the Double Diamond for problems that span organisations and systems, with a set of design principles and roles.
The civil servant's systems thinking journey
An applied guide connecting systems thinking principles to defining goals, understanding a system, designing collaboratively and evaluating change.