Yes, all of you who’ve been asking me about Whatsapp on the N900 numerous times, you have read the title correct! The Whatsapp client was found by me during my browsing on TMO and I’m quick enough to report it to the readers.

Yappari is a growing Whatsapp client for the N900. It’s in alpha stage. So far, basic messaging and groups are supported, but with your support, the client might attain full functionality.

While I myself didn’t take the chance to try it (ethical reasons, I see no apparent licence of the client and I have to agree to Whatsapp’s TOS), I can guide you through the installation process.

Fire up your X Terminal. Make sure all the depends are installed, type in these commands:

sudo gainroot

apt-get install libqt4-core libqt4-dbus libqt4-xml wget
apt-get install libqtm-contacts libqtm-systeminfo libqtm-messaging

Fetch the .deb file from here and drop it into MyDocs (the 32gB directory). Don’t leave the terminal yet. After fetching, go back to your terminal and type in these:

cd MyDocs
dpkg -i yappari*_armel.deb
rm yappari*_armel.deb
reboot

Your phone will reboot and after that you should have a functioning client.

If you require further assistance, see the thread on TMO.