I always kind put Stands and Summoning abilities in the same bracket. I'd imagine there's a decent amount of CRPGs with strong summoning abilities, but here are a few off the top of my head:
Baldur's Gate 1/2, like you mentioned- a lot of the arcane spells you could consider as being pretty stand-like. Simulacrum in particular creates a temporary clone of your character with mostly identical stats, and isn't confined to Wizards / Sorcerers thanks to Vhalior's Helm. You can also summon a familiar which can help in combat- although the wiser move is usually just to store it in your inventory to prevent it from dying and cause permanent stat penalties.
Diablo 2's necro has its summonable skeleton armies, although his golems are probably the most stand-like:
The Amazon and Assassin have their own summons with Shadows and Valkyries, but they're not typically strong enough to make a build around. Most Diablo-clones like Sacred 1/2, Grim Dawn, POE, etc are going to have viable summoning builds where you can rely on one strong summon or small armies of fodder to do the legwork.
Arcanum (basically the spiritual successor to Fallout 1/2) summoning builds are among the strongest specs in the game, with a lot of variety in how you can accomplish it. You can summon elementals, zombies, orcs / ogres, resurrect dead foes to use in your personal army or just have one and buff them to high heaven. If you're choosing technology spec instead of magic you can also build overpowered mechanical arachnids if you prefer your stands more like Baby Face.
On the more Indie side of things there's the Geneforge RPG series where summoning (or shaping) is the game's central mechanic. IMO this would probably be the closest to a genuine 'Stand' experience out of any of them- you can choose from an array of different creatures to focus around, spec into the monsters individually to either focus on an army vs. 1 single strong creature, and spec your primary character in a variety of different ways as well. Those games are not much in the graphics department but I found the first Geneforge to be incredibly immersive once I gave it an hour or two.
