Unity Learn features tutorials, projects and content on Unity. Additional free content is available during the pandemic.
The Gnonmen Workshop provides video tutorials by industry professionals on digital production, entertainment design and software . Topics include comic book art, character animation and modelling, storyboarding, colour theory and environment design.
3dtotal provides access to free digital art tutorials.
The Mocap Vaults is a performance capture school. Their website contains a number of free articles, videos and links about the world of motion capture.
GDC Vault provides access to in-depth design, technical and inspirational talks and slides from the influencers of the game development industry, taken from over 20 years of the worldwide Game Developers Conferences.