Research guides are designed to point you to the best resources within a library that deal with a foreign country's legal system. Often times you can search Google for the name of the country you are interested in & "legal research guide" and you will find results from law libraries. If from a library other than ours, you would need to take the additional step of seeing if our catalog contains the same material, otherwise you would need to submit an ILL.
Gateway Sources are much like research guides, with links that point us to various sources, but they are more robust in the explanation they give about the country's legal system. There are a handful of free websites that offer varying information about the background of a country's legal system and where you can find their legal documents:
The following database is one the library subscribes to and offers more robust and updated information about other countries around the world: