Rocket Lab
Rocket Lab is an American aerospace company that launches the Electron rocket and is developing the larger Neutron rocket. Rocket Lab has previously experimented with the recovery of the Electron 1st stage by allowing it to splashdown in the ocean for recovery by a ship.
For Neutron, the company is converting a barge into a droneship for downrange booster landings, similar to SpaceX.

Seaworker
Contract vessel chartered by Rocket Lab previously used for downrange recovery of the Electron booster in New Zealand. Photo: Rocket Lab

Seasurveyor
Contract vessel chartered by Rocket Lab multiple times for downrange recovery of the Electron booster in New Zealand. Photo: Rocket Lab