EXTENDROM_PACKAGES

All options for the EXTENDROM_PACKAGES flag usually placed in device/<vendor>/<model>/vendorsetup.sh

EXTENDROM_PACKAGES	description
noEOSappstore	removes the /e/ OS app store. background here - FAQ 0
F-Droid	what is that
F-DroidPrivilegedExtension	read the notes before enabling this!
additional_repos.xml	a lot of pre-configured F-Droid repos - MUST be enabled in F-Droid app first so you get what you want only
AuroraStore	an alternative google play store client - get (almost) any google play app you want
Phonesky
MicrogGmsCore
MagiskManager
DNS66
AdAway
Omega
Lawnchair-stable
Lawnchair-latest
K9-Mail-latest
Fennec
QKSMS
Etar

a current list of all available options can be found always here