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There are a number of resources available that you might find helpful. A good place to start might be Cisco’s learning network. There is a comprehensive program on itSM solutions available, although it might be overkill depending on what level of knowledge you are after. You can check it out and see if you are interested. https://learningnetwork.cisco.com/docs/DOC-11608
There is an online trade site called The ITSM Review that might be of more use if you are more interested in the specific offerings from a variety of companies. You can find that here: http://www.theitsmreview.com/vendors/