We have had the pleasure to use OpenWhatsApp for a couple of days now, I must say it is a very well polished 3rd party WhatsApp client, good news is the OpenWhatsApp dev team has made the BAR file available to download so everyone can get the client today.
Download BAR file here. If you need help installing visit our How To Sideload Android Apps(or BAR files) Onto Your BlackBerry 10 Device guide.