Currently there is no client for Maemo 5, although it's planned to have one. If don't want to wait, you can start one yourself. To get you started: Maemo 5 runs python2.5 Maemo 5 has PySide Maemo 5 has QtQuick 1.0 OpenWhatsapp for N9 (Wazapp) is in python + PySide, and uses QtQuick 1.1 + Meego components. So you just need to write a UI to have a working version