The Travel Market Simulator project aims at providing reference implementation, mainly in C++, of a travel market simulator, focusing on revenue management (RM) for airlines. It is intended to be used for applied research activities only: it is by no way intended to be used by production systems. It is a new breed of software and aims to become the new generation PODS (http://podsresearch.com/), which was instrumental in the inception of the Travel Market Simulator project. Over a dozen components have been implemented and are fully functional, encompassing for instance (but not limited to) traveller demand generation (booking requests), travel distribution (GDS/CRS), low fare search (price calculation and inventory availability calculation), customer choice modelling, revenue management, schedule and inventory management, revenue accounting. The Travel Market Simulator can used in either batch or hosted mode. That project makes an extensive use of existing open-source libraries for increased functionality, speed and accuracy. In particular the Boost (C++ Standard Extensions: http://www.boost.org) library is used.