Glass is one of the worst things to use for anything explosive. The only way you would get it to be useful in game terms would be to either make it so thick and heavy as to not be viable to carry or throw or to use pressure which also would require a crazy thick and heavy shell also.
Since we can already throw acid, there isn’t much to do with glass. It breaks too easy and melts with explosives.
Could make a shank with a rag wrapped around it for a 1 off stabby thing.
Can’t be much use as caltrops though either. Unless you step on a broken bottle bottom pointing straight up. Chances are slim to have flat glass do much.
Crafting crap seems the most likely. But besides jugs and art. Average run of the mill glass is pretty much used in bottles and windows.