Mangonel
The mangonel is like a portable catapult with firing in a spoon shape launcher
Battering ram
The battering is powerful but the catch is its super heavy and if they have a moat it useless the battering ram is used for smashing down doors
Ballista
Basically the ballista is a giant crossbow and was worked using tension
Trebuchet
The Trebuchet is giant and is massively and powerful but can't move
Siege Tower
The Siege Tower was pushed to the enemies castle and soldiers would climb and jump over the walls but its heavy and if a moat it's useless and its flammable