Blackmart is an app store developed by Blackmart. This application lets you download many of the most popular Android apps out there.
The Google Play store is very organized but you might be a bit discouraged by the amount of paid apps on the store. By using Blackmart, you'll always be download any app they have available always for free.
Getting all of your Android applications for free can be great but it does come with some downsides. Since Blackmart is a stripped-down app store, the store doesn't automatically update any applications you download from it. With the lack of alerts for updates as well, you might be missing key updates that hinder the important functionality you need for your applications to work.
Overall, Blackmart can be great if you're not looking to pay for any applications but it does come with a price.