Asset Library
Free-licence assets for building scenes: CC0, CC-BY or my own. Every asset's author, source and licence is in Third Party Notices.md.
Install
In Unity: Edit → Project Settings → Package Manager → Scoped Registries → + — Name Petar Mavrodiev, URL https://registry.npmjs.com, Scope com.mavrodiev → Save. Then Window → Package Manager → My Registries → Petar Mavrodiev.