You can add a “Browse Our Other Apps” button in your app, listing all your(publisher) applications in the Google Play Store app.

String urlApp = "market://search?q=pub:Google+Inc.";
String urlWeb = "<http://play.google.com/store/search?q=pub:Google+Inc.">;
try {
    Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(urlApp));
    setFlags(i);
    startActivity(i);
} catch (android.content.ActivityNotFoundException anfe) {
    Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(urlWeb)));
    setFlags(i);
    startActivity(i);
}
@SuppressWarnings("deprecation")
public void setFlags(Intent i) {
    i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)  {
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT);
    }
    else  {
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    }
}