I don't know yet
Design Principles is a website that collects design principles.
Atomic Habits is a book about building habits that sticks with you.
If This Then That is a website to automate and combine tasks in digital applications.
Better Stories is a website with methods for telling better stories.
Fluent Emoji is a web repository with every emoji in the Microsoft Fluent design system.
Wikipedia is a free encyclopedia on the internet.
Fun
Not Boring Software is a company that build fun apps for boring routines.
Drams is a collection of Framer components inspired by Dieter Rams' design principles.
Art of Play is a shop with physical puzzles, cards, and amusements.
Conversations on Quality is a video series of interviews with designers, hosted by Linear.
Today In Design is a newsletter for designers, sent out every weekday.
Design Notes is a podcast about creative work.
Pomodoro is a Pomodoro timer in a web app.
Hardware
Pen.
Paper.
iPad.
Apple Pencil.
PC, like a MacBook.
Software
Figma is a collaborative web application for wireframes and prototypes.
Frame0 is a MacOS, Windows, and Linux application for making wireframes.
Affinity Designer is a MacOS, Windows, and iPad application for raster and vector graphics.
Squoosh is a website for optimizing images.
Procreate is an iPad application for raster graphics.
Nomad Sculpt is an iPad application for 3D sculpting and modelling.
Spline is a collaborative web application for 3D modelling, animation, and interaction.
Raycast is a launcher application for MacOS and Windows.
CleanShot X is a screen capture application for MacOS.
Learn
Visual Design is website book about how to improve your visual design.
Learning Through Play is a website with articles and guidelines for the importance of play, and being playful as a way to learn.
Smart Interface Design Patterns is a course with guidelines and best practices for common components in user interfaces.
Design System
Atomic Design (book)
Design Systems Database is a directory of design systems.
Design Systems is a design systems publication by Figma.
Storybook is a web tool to present user interface components for development, testing, and documentation.
Design Thinking
The Core Model is a method for creating digital services and products.
Design Better is a podcast about product design.
99% Invisible is a podcast about how designers see the world.
Untools is a website to learn methods for practical problem solution.
The Design Sprint is a book on how to build and test a prototype in five days.
Product Thinking
Agile Manifesto is how you should develop software.
When Coffee and Kale Compete is a free book on how you find the core problem, and how you solve that.
User Interface
Practical UI (book)
Refactoring UI is a book about front-end design.
Blocks is a low fidelity wireframe design kit for Figma.
Mobbin is a website with design inspiration for apps and websites.
Layers is a website with design inspiration for apps and websites.
User Experience
Laws of UX is a book about the principles of user experience design.
Raut is a Norwegian newsletter about user experience.
Test, Research, Analyse
Rocket Surgery Made Easy is a book about testing what you build on your users, to verify that you make something that someone need.
Don't Make Me Think is a book about building usable services and products on a digital screen.
Tally is a web tool for building forms to collect feedback from users.
A/B Test Design is a website with A/B test results from apps and websites.