Join Date: May 2004
Location: Sumner, WA
Bikes: '92 novara ponderosa, '74 schwinn le tour, Novara fusion, novara transfer, novara randonee(2), novara careema pro, novara bonita(2).
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About a half dozen common[ish]. Just get what you need.
In no real order, here are the ones your likely to come across.
2 prong suntour
2 prong regina
4 prong suntour
2 prong shimano
old shimano spline(small diameter)
new, most common, shimano spline also works on sunrace and falcon and cassette lockrings
campy stuff (I dunno much bout it)
Saches/SRAM freewheel may use their own I don't know.
The 2 prong(and even 4 prong) I wouldn't bother with, unless restoration is the goal. As dismantling and the use of a vise is generally needed(2prongs suck), and who would want to put something like that back on. If done carefully the vise method will not hurt the freewheel and it can be reassembled.
Always use anti-seize on the freewheel threads! It makes the future much nicer.