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VMod is an addon to Valkyrien Skies that adds a Toolgun - a tool that allows player to make various constraints such as:

Connection - Creates a Weld/Bearing/Ball Socket like connection between two objects.
Rope - Creates a rope
Hydraulics - Extends and retracts when a signal is given
Physics Rope - A rope that is created from physical components
Slider - Creates a slider connection
Sync Rotation - Synchronises rotation of 2 ships

And tools such as:

Thruster - Create a thruster
Gravity Changer - Change gravity for a single ship or a whole connected structure.
Disable Collisions - Will disable collisions between two ships or a ship and a world.
Schematic - Create schematic of the whole connected structure.
Scale - Scale not just one ship, but a whole object.
Strip - Strip VMod constraints either in block radius or all constraints connected to a ship
Ship Remover - Removes ships
Mass Changer - Changes total mass of a ship

It's highly inspired by Garry's Mod, so if you've played it before, you will find many similarities to its Toolgun.