The design of the space tug is based on the upper stage of the Skyrora XL vehicle, with adaptations that will allow it the technology to survive in a space environment.
Most sources should be linked in the texts and headings as revealed by mouse-over, but here are they listed for visibility.
Space Tug, In-Space Logistics
Space Tug, Transport Service (LEO-GEO), Transport Service (LEO-Moon), In-Space Logistics
4) Early stage
Transport Service (LEO-Moon), ISRU (In Situ Resource Utilization), Space Tug, In-Space Logistics
Transport Service (LEO-Moon), Commercial Lunar Lander, Space Tug
Resources - Energy, Space Tug, Nuclear Fusion Power, In-Space Logistics
Orbital Maneuvering Vehicle (OMV)
Space Tug, Active Debris Removal (ADR), On-Orbit Servicing, In-Space Logistics
Meteoroid Complementary Descent Module, ASTREO
Space Tug, Transport Service (Re-Entry), In-Space Logistics
Space Tug, In-Space Manufacturing, In-Space Logistics
LOLA, LUCAS, OSSIE
Transport Service (LEO-Moon), Commercial Lunar Lander, Space Tug, In-Space Logistics