Sourceful - A search engine for publicly-sourced Google docs
UX Database - The biggest free curated product design resources & tools
Topic Research by SEMrush - Content ideas that resonate with your audience
Freebiesbug - Collection of the best free web design resources.
UX Research Field Guide - Your map to the world of UX research 🌏🕵️♀️
Dev Resources - Collaborative list of resources for developers