Glass-study.com, Glass-zoo and Glasscatalogue are all subscription sites, idea being to earn me some money so that I can spend all of my time uploading my library to them....does not work in practise of course ;-) . Glass-study.com membership covers all 3, Glass-Zoo is also subscribable separately. No-one can currently subscribe except manually via me due to outdated software problems and a hacker. But all existing subscribers are open-ended until I get fully back to work again.
Glass-study.org is free to register on but offers little of use unless you put documents up for free or paid, download those by others... or to track your own downloads. Not very active yet in that sphere.
No one gets any of the money donated which is used to pay hosting related costs for all sites and the rest in a deposit account. Accounts for the registered non-profit association will shortly appear on the site. (Another task!!!)
This still needs people to make it completely independent of me and ensure it can meet its purpose - I might just end up asking a library to take it and the fund over... but previous attempts to do that did not get so far. With a funding and approach in place it might be more successful... but would still need voluntary support or a much larger fund for professional support.. Sites like Scotlandś Glass can still keep growing regardless of the Association as they already have a core of volunteers, but even their only me on technical back-end.
Glass bibliography also on Glass-study.org site has yet another registration... FREE... but registration is for those who want to add information, reviews etc. to the bibliography. Or for those who want to create a bibliography for their own research and have it organised in one of the many standard formats. I still have to finish migrating the original biblio into this new one (hopefully its final conversion) and then get on with expanding it... hopefully others will see fit to expand it too. It will also be getting upgraded soon and be a lot faster and better for including non-book references. It is already suited to listing individual articles within journals too. Also it uses an industry standard format for bibliographies and users can readily transfer to other bibliographic tools that they use.
So thatś the story... hope it clears up confusion. If not ask away