While I haven’t had the time to work on anything in almost a year now, these are the brands I have used and enjoyed.
Liquid Fusion - Waterproof urethane glue. Good for sealing reroots or repairing tears to vinyl.
Testors Dullcote - Spray sealant. The current label on this one might look different than pictured in the link.
Testors acrylic paint - Smooth paint that rarely needs thinned, but is hard to find. You can find Testors Model Master Acryl paints, which are very similar, but not quite the same.
Createx airbrush acrylics - another great paint that does not need thinned. These paints cure fully with heat. I have tried blow drying them finished job to try and heat cure the paint, but it doesn’t work well. The paint scratches easily, and should be left to dry a bit longer than average. They need to be sealed very well.
Deco Art, Triple Thick - Highly glossy, durable sealant. A little goes a long way. Do not touch it till it dries 100% solid. If you are doing it thick, apply it as fast as possible, with as little brush strokes as possible, or you run the risk of making it dry cloudy.
Poly Flake glitter - very fine glitter
Loctite Super Glue GEL - for gluing heads back on.
Aves, Apoxie Sculpt - two part air dry sculpting clay.
Mod Podge matte-mat - watered down only, to the consistency of milk. Makes a good brush on sealant,but it is NOT waterproof. Should not be used in humid climates, or applied on humid days. The pony it is used on should not be stored in a humid place. It can become sticky. That said, I have had no problems with it personally, using it thinned down.
Paashe airbrush - I THINK this is the one I bought, but not sure.
Dremel - Mostly used for cutting needles for rerooting tools, but also has been useful in sanding larger Apoxie Sculpt projects.
Reroot tool - There are no brand names for these. they are most often hand made. I used to make and sell them, but I have not had the time for such things in a long while.
Doll Hair is tricky.. RetroDollsUS.com has the best service I have experienced, however, most of their stock is preorder only. DollyHair.com has a huge selection, but you risk your order being wrong, shorted, over charged, or never sent at all in the worst case. They have horrible customer service. But right now, they have the best in stock selection. I do not personally buy from them directly any longer. Order from them at your own risk.
Those are the main things, off the top of my head. Feel free to ask about something more specific if I haven’t listed it here. I will do my best to answer any and all questions :)