Aur: Arch User Repository
The Arch User Repository contains user generated package build scripts (PKGBUILD), that can be used to easily build additional packages for your Arch Linux and also Arch Linux ARM installation. For packages that don't need compiling, see Arch Linux ARM aarch64 (or Arch Linux ARM armv7h (for 32bit devices)).
Please note: DanctNIX (Arch Linux ARM for PinePhone (Pro) and PineTab) and Kupfer specific packages are not listed here, as they are not indexed on repology. You can check their PKGBUILDs manually: DanctNIX; Kupfer index, Gitlab.
You can also use the AUR with Manjaro, but it may not work, packages may fail to build. For Manjaro packages, see Manjaro stable or Manjaro unstable. The following Manjaro PKGBUILDs may be interesting (for Arch users): Phosh, Plasma Mobile, Nemo Mobile, Core Box.