A new paradigm, known as Enterprise Mashups, has been gain momentum during the last years. By empowering actual business end-users to create and adapt individual enterprise applications, Enterprise Mashups implicate a shift concerning a collaborative software development and consumption process. Upcoming Mashup tools prove the growing relevance of this paradigm in the industry, both in the consumer and enterprise-oriented market. However, a market overview of the different tools is still missing. In this paper, we introduce a classification of Mashup tools and evaluate selected tools of the different clusters according to the perspectives general information, functionality and usability. Finally, we classify more than 30 tools in the designed classification model and present the observed market trends in context of Enterprise Mashups. Keywords: Enterprise Mashups, Internet of Services (IoS), Market Overview, Classification.