The freebie today is the Yellowstone Runabout.
It comes with a special engine that enables any shuttle craft to use an AoE slow debuff.
You can also use the standard Danube runabout skin instead of the Yellowstone skin.
It is better than a standard runabout and better than a standard shuttle.
Though I think Captain's Yacht, Delta Flyer and Peregrine fighter still beat it.
Klingons can claim the KDF fighter for free today, too.