Roughly:
InventorRaccoon's
Arsenal Expansion - for I think some Cavaliers in round 1 wave 1.
AxleMC131's
Disassemble Reassemble - LP Mantas in the round 2 Luddic Path wave.
Dark Revenant's
Ship & Weapon Pack - Wall, LP Dominator, Framebreaker (LP Onslaught), more LP ships and stuff.
Tartiflette's
Torchships and Deadly Armaments - All sorts of stuff sprinkled throughout the waves.
Tartiflette's
Seeker Ship Pack - Notably the Cassowary, but also the Gawon, Bullhorns, Clippers, etc.
Nia Tahl's
Tahlan Shipworks - Legio Infernalis ships (round 1 wave 3), Great Houses of Kassadar ships (round 2 wave 2), Lostech ships (round 1 wave 5), the Rosenritters (of round 2 wave 5) and I think a few other miscellaneous ships.
The Keep and the Rampage have yet to be added to any ship packs, but will probably end up in Seeker eventually.
You can find links to the mods either in the mod index, on the Discord, or in the
tournament spreadsheet.