These are built from the open source version of Android and do not have Google stuff:

• LineageOS
• GrapheneOS (can be installed on Pixels)

These are based on various flavors of Linux (Android is technically a flavor of Linux too):

• PureOS (Librem 5 line by Purism)
• Ubuntu Touch (support for lots of devices, but typically not the flagships)
• Manjaro OS (on PinePhone by PINE64, an open source hardware community, which is the best way I can describe it)