Software to design PSU?

What software (preferably open source / free) do all of you use to design your PSU ?

15 years ago, I used PSUD for an Aikido preamp. I just re-downloaded that. But it is rather limited, and not suitable for more complex PSU designs that use transistor regulators.

I would like to redesign the PSU for my phono pre (EAR834p clone), using a tube rectifier (5AR4) and tube regulators (0D3s), hammond 15H choke, etc to get a stable 285V DC.

I would model the current layout. Vs my new layout.

Is LTSpice that best option? I think I last used that software back in maybe 2002?