The OPEProp Library for Crystal isn't hosted anywhere right now. So to use it, you can download the source file, and include it in any of your projects.

To download the source with wget, run the following in your console:

wget https://opeprop.kyrylshyshko.me/static/source/opeprop.cr

Or just download it from opeprop.kyrylshyshko.me/static/source/opeprop.cr

Now, you can start exploring the library. Learn how to create a model