The worldwide market of terminal operating systems is very heterogeneous. It is characterised by many providers offering more than one product each. The range of functions of each product is diverse depending on its scope and purpose. This market survey is supposed to enable the public to gain more insight into the market. Therefore, public information as well as information derived from a survey questionnaire has been evaluated using a scheme that is independent of the respective terminal type. The third issue of this study provides an updated list of companies providing TOS systems including their product and features, as well as new insights regarding future developments of software supporting terminal operation.