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
InVision Studio - The world’s most powerful screen design tool
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
Circular Design Guide - Toolkit that brings design thinking full circle
Sprint - How to solve big problems and test new ideas in 5 days