Zerogee
Clencher's Bogleman
Mamod locos Tac (I think, or are they methylated spirit ?)
Meths burners.... sometimes referred to (possibly over the Pond?) as "Spirit Fired"?
Just to be pedantic (what, me?) about the list of motive power methods, there is also the strange hybrid of "Track power R/C", where you supply a constant voltage to the track (a bit like DCC has but as DC current rather than AC, and with no superimposed control signal) and then a radio module/decoder in each loco picks up signals from an R/C handset which tells that loco what to do with the electrickery that it is picking up from the rails.... Such a control setup is quite cheaply available from TL45 using a tiny "key fob" style transmitter.
I'm only pointing this out for completeness of the list, NOT to recommend this as a viable type of system....
Jon.