I've been using the BlackBerry Z10 as my daily smartphone and last week I mentioned . To fill in the app gap as BlackBerry continues to fill out their catalog, I installed several Android apps.
The folks at CrackBerry.com have a couple of great posts to help Windows and Mac users to sideload apps on your BlackBerry 10 device. I also found a helpful site that lists tons of Android apps you can install on your BB10 device.
A few of these Android apps appear in BlackBerry World, but most of what I show in this image gallery are sideloaded apps. Performance isn't always quite as good as native apps, but it's much better than I was led to believe, and having Android apps fill the gap is a viable option for BlackBerry 10 owners.