Swiftkey used to be a paid app for Android (and iOS, I believe), but it's now free for download, and you get all the features, except for premium themes. The keyboard is much more useful than the stock keyboards that most phones come with. It's a predictive keyboard, although you can control how much automatic predictions come into play. It features Swype, voice entry, and other features, too. I highly recommend downloading this app, and I've used it since it was a paid app.
