The Unique Ship Challenge III was a contest held on the Spelljammer Mailing List in February of 1999. It's purpose was to create interesting, ready-to-use ships for Spelljammer DMs.
* Indicates that these entries were also submitted to the Unique Ship Challenge II.
The First, Second, and Third Place winning entries:
Blackdawn — Blue Orion — Celestial Swamp* — Flame! — Golden Hawk — Grey Feather* — Lucky Victory — NeogiSlayer — Queststar* — Sea of Stars* — Starbeast — Viper — Workhorse