EXTENDROM_PACKAGES

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

EXTENDROM_PACKAGES	description	more
noEOSappstore	removes the /e/ OS app store. background here - FAQ 0
F-Droid	F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications	Homepage
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	Homepage
Phonesky	the original Google Play store - but patched to allow in-app purchases on microG ROMs (e.g. /e/ OS)
MicrogGmsCore	MicroG GmsCore is a free software reimplementation of Google's Play Services. Read the notes here	Homepage
MagiskManager	root your device	Homepage
DNS66	DNS66 allows blocking host names via DNS	Homepage
AdAway
Omega
Lawnchair-stable
Lawnchair-latest
K9-Mail-latest
Fennec
QKSMS
Etar

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