The Optickle 2 code repository is https://github.com/Optickle/Optickle/tree/Optickle2
And a zip file of the current working version can be found at https://github.com/Optickle/Optickle/archive/Optickle2.zip
Manuals can be found in https://github.com/Optickle/Optickle/tree/Optickle2/Docs
We used to use Optickle, but in 2014, Optickle2 was released. New features in Optickle2 is
New users are encouraged to use Optickle2.
Example code for simulating a Fabry-Perot cavity is included in Example.zip