JavaTuner with some extra "custom" temperaments. Save this HTML page on your system to add your own.

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Custom temperaments/tunings (to load, type the uppercase key in the applet):

Key	Temperament/tuning	Notes
D	Mean semitone
F	French
G	Grammateus
I	Irregular French 17th
L	Lucy's temperament	See comments
N	Neidhardt	1932 Village [thanks to Johan Norrback]
M	Marpurg
R	Rameau
T	French (2)	As per Lindsay's article in EM [thanks to John Wood]

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Pending work: sort out the Neidhardts (I know of at least eight: which is most typical -- I get conflicting infos)