PathPilot HUB
From Rob Haworth: Laguna Creek HS EGUSD, Tomach – PathPilot HUB is a cloud-based, full-featured Tormach simulator.
Autodesk – Fusion 360
self paced learning, Each course includes videos, step-by-step tutorials, and downloadable 3D models to help you learn Fusion 360 at your own pace.
NCSIMUL
NCSIMUL Machine is comprehensive G-Code verification software for smart CNC machining, including machine simulation and toolpath optimization prior to transferal of code to CNC machines.
Interfaced with CAM software and based on virtual machines that are digital twins of your real machines, it ensures the accuracy of your NC code.
Immerse2Learn
Possible that you can have your students remotely access this using a remote desktop such as Splashtop or Chrome Remote Desktop.
Haas Online
They have an entire certification program that runs 20 to 30 hours and leads up scheduling an in-person certification if they want.