XInstaller

Enable/disable:

- Signatures checking (globally or only during installations)

- Signatures checking for F-Droid

- Apps downgrading

- Apps verifying

- Unknown app installing

- Installing apps on external storage

- Forward lock flag

- Keep apps data after uninstalling

- Disabling system apps (+ you can turn off notifications for them!)

- Uninstalling device admins

- Auto installing

- Auto uninstalling

- Auto closing after uninstalling

- Auto closing after installing

- Auto launching (apps) after installing

- Permissions checking

- Apps backuping when installing (to /sdcard/XInstaller)

- JAR verifying

- Signatures verifying

- Installing unsigned apps

- Auto backing up (related to adb backup feature)

- Making any app debuggable

- Showing package names in App info (bonus: click on app version to copy package name)

- Showing version info in App info

- Deleting APK files after installing

- Moving unmovable apps

- Checking SDK version

- Installing in background

- Uninstalling in background

- Launching apps (click on app icon in App info to launch app)

- Opening apps in Google Play (long press app icon in App info to open app in Google Play)

- Exporting apps (click on app name in App info to export APK file to XInstaller folder; bonus: long press app name in App info to copy app name)

- Auto enabling clear buttons in App info

- Uninstalling system apps (long press Disable button in App info to uninstall (delete) system app)

- Backing up all (even unbackupable) apps

- Changing device properties

- Hiding app crashes

- Confirm signatures check

and maybe more!