WaStat – WhatsApp tracker - WaStat – WhatsApp tracker app shows the last online time of a phone number at a glance, so you can contact them whenever they get online to share something important to them.
Empathy - Apps/Empathy - GNOME Wiki!
Last seen tracker for WhatsApp - Last seen tracker for WhatsApp app helps you save all your WhatsApp data on the internal storage to view all your recent conversations at a glance.
Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
Whatsdog Last Seen - Whatsdog Last Seen app shows the accurate last online time of all the phone numbers in your contact list to message them right on time and get an instant reply from them.
Gajim - Full featured and easy to use Jabber client