Aurora is on version 2.5.0 C#, available at the Aurora Forums.
Contact Erik on the forum for a wiki account.
Fleet
At the heart of Aurora is a naval simulation that isn't too different from modern seafaring vessels and their operations. Ships are organized in fleets, task forces and task groups. They need fuel, spare parts and ammunition. They need maintenance and repairs. The crews need a lot of training before they can be expected to perform well in a battle. And they need up-to-date information about the enemy. All that is simulated in the game.
In Port
Support Vessels
If you equipped every ship with enough fuel tanks to travel halfway through the galaxy, you'd have no more room for weapons. Dito for missile reloads and spare parts (maintenance supplies). So you build specialized vessels to transport these and assign them to a task force as per your needs.
All special orders related to them are only available if you designate ship classes as tanker, supply ship or collier in the ship design window.
You can also build maintenance ships which contain Maintenance Modules instead of performing standard maintenance at a base.