A good maxim is that one generally can't get something for nothing and you get what you pay for. Yes, there are free sites out there (that can be found with a RG search) but, IMHO, they can't be better than proprietary software and subscription databases...
Are you saying that the National University of Science and Technology, Moscow, Russia can't afford a subscription?
Dear Alex, here is a good option, https://www.crystalimpact.com/match/ , 1month free of charge, as far as I remember, it also has some limitations in functionality during that period, whatever, you also can download a crystallography database for free of charge (well, not a full version).