Tradewinds is a pseudo mod added via CustomStuff3. Tradewinds shows up under a regular NEI search as a list of items, appearing as if they belong to a mod named Tradewinds, but no such mod exists.
Tradewinds mod items are items added directly by the Tradewinds dev team, and are typically items used via Minetweaker to create new recipes, substitute in place of other items, or used for other Tradewinds-specific purposes.
Archaeology and Dungeon Loot
Tradewinds (Mod) adds a large selection of items that can be found in dungeons and randomly generated structured (via Recurrent Complex) that serve as part of Tradewinds' overall loot and archaeology system. More info here.