The best replacement for xmlspy is oxygen.

The best alternatives to xmlspy are rated as following:
★★★★★  oxygen
★★★★  stylus studio
★★★  soapui
★★  xml notepad
★  liquid xml

Your alternative for xmlspy is not listed? Suggest!
Speaking about xmlspy, one probably shouldn't forget about saxon.

Other search terms related to xmlspy and their ratings are:
★★★★★ saxon
You have in mind a companion for xmlspy and it is not yet here? Propose!



Google Trends

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xmlspy
oxygen
stylus studio