Real space flight emulator - for all that crash the lander on TSS/8

Now you can be there live in SPACE … Que up An der schönen, blauen Donau
http://orbit.medphys.ucl.ac.uk/

Very nice! I think their Apollo plugin is based on the Virtual AGC project which has some good introductory material

It’s also been ported to create this in-browser Apollo experience:
Moonjs: An Online Apollo Guidance Computer (AGC) Simulator

(BTW this is the TSS/8 thread: Connect to a PDP-8/e running TSS/8.24 and this is the (1976?) lunar landing program available on that machine.)