Apparently Cinematheca is a typical movie cataloguer and organizer, and it is, but it is also designed so that movie fans can look at the movie lists of friends and acquaintances, so that you can keep up to date with the latest movies acquired by them.
First and foremost in Cinematheca you must create an account that identifies you on the author`s website. This way you can access, via the Internet, the data of all those who are also registered there, then search through and look at their movie lists.
As for the rest, Cinematheca has the usual cataloging features: you can subdivide into different folders, add information on the title, actors, year, etc.