Opera Max is free and, reportedly, it can "extend the life of your data plan by up to 50%, especially if you use video and image-heavy apps such as Vine, Instagram, Vevo or Flipboard."
We have yet to test the new app. We just downloaded it and, as you can see in the screenshot on the left, there are no less that 15,343 people (pre-registered users) in front of us who will be getting the app first. Anyway, if you want to give Opera Max a try, you can grab it at the second source link below. The app works only on devices running at least Android 4.0.
Meanwhile, you can take a look at this official Opera Max promo video:
sources: Opera, Google Play