Bonodi XML Editor 

Bonodi XML Editor is a multilingual XML editor for MS Windows 98/Me/NT4/2000/XP. You can edit XML documents in English, Japanese, Chinese, Korean, Russian, Greek, Thai, Hebrew, Arabic, and other languages on any language version of MS Windows.
xml editor internet web search replace regular expression editors xml html xhtml xml software xml tool xsl transformation xslt

Xselerator 

It's got everything an XSLT Editor should have plus a bit more like Intellisense and tag auto-complete! It's also half the price of XMLSpy... so it's great value. A 30 day free trial is available.
xml xsl editor debugger developer tool