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
Magisk	pre-root your device , signed with the official Magisk keys	Homepage
SignMagisk	pre-root your device , signed with your own keys	Homepage
DNS66	DNS66 allows blocking host names via DNS - does NOT require root	Homepage
AdAway	A Free and Open Source ad blocker for Android	Homepage
Lawnchair-stable	Lawnchair is the customizable Pixel Launcher alternative.	Homepage
Lawnchair-latest	as Lawnchair-stable but might contain new features/bugs	TG group
Omega	Launcher forked from Lawnchair	Homepage
K9-Mail-latest	Full-featured email client	Homepage
Fennec	Browser that supports current and anticipated web standards.	Homepage
QKSMS	Replacement for the stock AOSP messaging app.	Homepage
Etar	Etar is a material designed open source calendar, for everyone!	Homepage

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