IzzyOnDroid is, in fact, an unofficial open-source client for the F-Droid repository IzzyOnDroid.

■ Features □

• Elegantly designed user interface.
• Ability to categorize apps.
• Includes a built-in APK installer.
• Auto dark/light theme.
• And many more...

♤ What's new ♤

• Fixed installer crashing on Android 12 (S).
• Introduced crash reporting.
• Updated build tools and dependencies.
• Miscellaneous changes.

Open Source: https://gitlab.com/