iSwipe is the first gesture-based keyboard for iOS (pre-8.0)

Features

Uses objc-runtime to hook onto system keyboard methods and extend functionality
Converts input points into vector angles
Implements both a dynamic programming and greedy algorithm to match input to words
Best match is entered, remaining options are ranked in the suggestions box

Building

Requires Xcode and Xcode Command Line Tools.

git clone 'https://github.com/wyndwarrior/iSwipe.git'
cd iSwipe
git submodule update --init --recursive
make