SwiftKey 4 is the latest version of one of the best Android replacement keyboards. The update introduces "Flow," or swipe to type, new gestures, and word prediction for 60 languages.
Flow is a that feature lets you slide your finger to the space bar, rather than lifting it and pausing while you're typing a sentence. The refresh also gives easier corrections, and pays attention to your own typing habits, to adjust prediction accordingly. SwiftKey 4 comes in tablet and smartphone flavors, and it's on sale for $2 (down from the usual $4) for new users, and free if you're already using the clairvoyant app. [Google Play: Tablet, Smartphone]