Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

An alternative frontend for YouTube, for Android.

Material design file manager for Android

APKUpdater is an open source tool that simplifies the process of finding updates for your installed apps.

A novel Android app store focused on security, privacy, and usability

Easy app for managing your files without ads, respecting your privacy & security

Easy and quick contact management with no ads, handles groups and favorites too.

A full-featured browser reference implementation using Mozilla Android Components.