XSL Lint is a semantic lint checker for XSL. It detects:
An incorrect XSLT URI.
Failure to provide a version.
Duplicate match patterns.
Modes that are used but never defined
Modes that are defined but never used
Named templates that are used but never defined
Named templates that are defined but never used
Templates that use name= where match= was probably intended
xsl:call-template elements that contain anything other than xsl:with-param
Variable/parameter references that are not defined at the point of use.
fo: elements that aren't part of the XSL 1.0 PR.
fo: element properties that aren't part of the XSL 1.0 PR.
There's no “latest release” to speak of. This is still alpha code.