Where can I find the source code for I Write Like?
The online version of I Write Like is open source. Its code and the trained data corpus can be found here:
https://github.com/coding-robots/goiwl
This version is written in Go.
There is also a previous version written in Racket (a variant of Scheme):
https://github.com/coding-robots/iwl
The iOS/Mac apps are not open source, however they use the same
algorithm ported to Swift.