SAI (Split APKs Installer) is an Android app that lets you install split APKs (such as ones distributed as Android App Bundle). It has both rooted and rootless installation methods.
<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="80"> <img src="https://play.google.com/intl/en_us/badges/images/generic/en-play-badge.png" alt="Get it on Google Play" height="80">
Please read Contributing guide
SAI adds some meta information to .apks files it exports, you can find the description of the format it uses in the Meta format description
SAI is licensed under GPLv3