[XeTeX] Font Browser

[Gerrit]

Hello everybody,

this question must seem really easy, but I cannot find anything usable 
on the Internet. Unfortunately it is only partially related to Xetex.

I wonder, if you maybe know about a font browser for Windows which will 
show me the Opentype tables?

I know that I can actually use the Opentype features in Xetex, but my 
problem is that I don’t always know, which features the font actually 
possesses. So I thought about a font browser, where I can see e.g. the 
character “1” and then select “Oldstylenum” and the glyph changes.

I searched in the Internet, but can only find some font browsers who do 
not show the Opentype features. I think, a freeware programme would be best

Thank you!
Gerrit