FlickBoard is a flicking-style keyboard, in the style of MessagEase and Thumb-Key.
Type the letters in the center of a key by tapping it. Type the keys in the corners by swiping in that direction. That's it!
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The latest release builds are also available from GitHub Releases, but I recommend downloading from one of the above instead to get automatic updates.
You can also build it yourself, by running the following on a computer that is connected to your phone:
$ ./gradlew installPlainDebugThis requires the phone to have USB debugging enabled, and your computer to have the Android SDK installed.
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It's proprietary, and is currently threatening everyone's existing installations unless they subscribe.
Thumb-Key intentionally doesn't support some gestures that MessagEase supports.