BlackBerry QNX:

BlackBerry QNX Tablet OS features BlackBerry Bridge that allows you switch screens by opening that app on your PlayBook. It offers unmatched web experience, real-time multitasking and new ways to connect your Smartphone and Tablet via BlackBerry Bridge. With help of this built-in message lets you quickly and easily manage both your email and social network messages with a unified inbox. You can even view and edit Microsoft Word, Excel and PowerPoint files and attachments. It is highly secure and reliable OS that keep personal and work data safe and protected lets you work and play without worry.

BlackBerry 10 OS:

BlackBerry 10 OS offers the multitasking feature called the Flow View. In this all apps are naturally integrated into the OS, letting you move smoothly from task to task without having to first drop what you're doing. It also boasts the strong messaging abilities which have unified inbox plus new innovations like the advanced virtual keyboard. BlackBerry 10 OS  supports the video chat. A sensual UI is another feature that will help you to answer or reject calls by performing a long press then swiping up or down.

BlackBerry 7 OS:

BlackBerry 7 OS is the most intuitive and powerful experience. It features Mobile Hotspot that makes the productivity easier.  With help of this feature you can turn on Mobile Hotspot on your BlackBerry Smartphone, found under Manage Connections, and create a hotspot. Then share it by connecting up to five Wi-Fi devices at once. BlackBerry Tag is another feature that simply tap your Near Field Communication (NFC) enabled BlackBerry Smartphone against another NFC-enabled BlackBerry Smartphone. Another interesting feature is Wi-Fi calling that got Wi-Fi connectivity by connecting to Mobile Hotspot, make calls over Wi-Fi instead of using your plan’s minutes.

BlackBerry 6 OS:

BlackBerry 6 OS helps to load the pages quickly. There is tabbed browsing so you can have multiple web pages open at once. It gives faster and richer web browsing. You can even get a streamlined experience with album art, new camera modes, sharing, built-in YouTube app. It features simple setup that has the ability to power up for the first time and see a short intro video, then go straight to setting up and personalize it. You can also see your entire social and RSS feeds in one place. 

BlackBerry 5 OS:

BlackBerry 5 OS offers Auto Correct / Word Completion feature or QWERTY based Smartphone’s. You can synchronize Multiple Contact Folders or Address Books. With BlackBerry 5 OS any email messages that are flagged for follow up on the email application on the computer will have that information reconciled with the email message item on the BlackBerry Smartphone and shown next to the subject in the Messages application. Volume Overlay is another interesting feature that will display volume indicator over top of any application if the volume level is adjusted.

Source : Us.blackberry