This is a mod all about creating castle gates and dungeons. It contains dungeon doors and bars, and also a set of nodes for constructing larger swinging and sliding gates.
This allows the construction of portcullises and drawbridges as well as conventional swinging doors. Use the screwdriver to reorient gate pieces as needed for these purposes.
Works very well: Big moving gates
You can see them in action on the YourLand server. Huge city gates as well as smaller ones can be built with this system and work very convincingly.
But beware: When you build your first one, make sure to build it in an enclosed room. The gate may start wandering off in unexpected directions. It takes a bit of experimenting and practice to get them going the right way. Make sure it can't wander off into the sunset :-)