You can try FXSL - while it does not support SVG directly, it provides some of the functions needed for some transformations - for example, trigonometric functions.
Update . There are several XSLT stylesheets published by Marrow, author of XSelerator, back in 2002. You can find them at topxml.com, but warn that some people have warned me that there is a Trojan on this site, so you should be equipped with good malware protection before clicking on the link above !
Dimitre novatchev
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