Xabber

Xabber is a free, open-source XMPP messenger for Android. It supports multiple accounts, has a clean interface, and strong security with end-to-end encryption. It's fast, ad-free, and works with all standard XMPP servers. Also supports file sharing and custom notifications. Browser version available, iOS coming soon. Learn more at xabber.com or follow @xabber_xmpp on Twitter.