Horse Rack has awesome (3d Printed I believe) Traditional and stablemate scale collapsible storage racks with clear plastic tubing on all uprights which would be great for tippy models on shelves and for taking to shows. I will be ordering some soon so I will make sure to post a review!
Cabinets!
Most countries now have IKEA stores so the DETOLF Glass-door cabinet shown here is always a good bet for some cheap easy storage especially if you have limited space for large foot print cabinets
If your after something more substantial and with better dust-proofness ModuCase shown here
might be what you're after offering custom made and off the shelf modular cabinets and lighting systems around the world
My Modelhorse Database is a site for keeping a database of all your models and their details.
I can only speak for the free version at this time but it's worked well for me over the past few years although I admit it's not as up to date as I would like it to be!
It allows you to input all the details about your model such as age, name, gender, breed, price and date of purchase, customizer, mould name .etc along with being able to upload a picture of the model from your PC or phone.
All the individual model horses are then able to be searched and sorted by various filters and accessed where ever you have the internet and I believe you can also download a back up of your info to your own PC for safe keeping