This toolkit has been saved 3 times.
[Now defunct. Link goes to internet archive from 2018, when MindLab closed]. One of the pioneers of public sector design, Mindlab, developed a set of tools to find and define problems as well as new approaches to solving them. This toolset contains some of the most commonly used in the design practice (user journey, pattern recognition, etc).
Link to toolkit
https://web.archive.org/web/20181124084759/http://mind-lab.dk/en/methods