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 Sprint Kits - A pre-assembled kit for GV design sprints.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Design Principles - An open source repository of design principles and methods
Facebook Design - Resources for Designers from the Facebook Design team
Land Book - The homeland for fine websites
InVision Studio - The world’s most powerful screen design tool