In August last year, LINE, a popular iOS and Android cross platform messaging app was launched on BlackBerry. Hailing from japan, this one has a advantage over the competition (Whatsapp) where they have a web browser version for Tablets along with a PC/MAC client. However, even up till today, the BlackBerry (legacy) version still remains rather buggy. Nonetheless, pass the legacy devices, here we have on BlackBerry z10, LINE.
Now, the catch here is, you have to sideload it into the device yourself.