Based on our record, Google Design Sprint Kit seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Also Google (as in the company not the verb) has a free version of their discovery techniques here https://designsprintkit.withgoogle.com/. Source: about 1 year ago
Design Principles - An open source repository of design principles and methods
Design Sprint Kits - A pre-assembled kit for GV design sprints.
Product Disrupt - A design student's list of resources to learn Product Design
Within Magazine - The source for design leaders
Sprint - How to solve big problems and test new ideas in 5 days
Laws of UX - Key maxims that designers must consider when building UX