Vapour

Vapour http://vapour.sourceforge.net/ is a validation service to check whether semantic web data is correctly published according to the current best practices, as defined by the Linked Data http://www.w3.org/DesignIssues/LinkedData.html principles, the Best Practice Recipes http://www.w3.org/TR/swbp-vocab-pub/ and the Cool URIs http://www.w3.org/TR/cooluris/.

Vapour is available as a public web service http://validator.linkeddata.org/vapour , but also as open source software under the terms of the W3C License, so you can set up your own service or modify the source code in Python, if needed.