MyMobileWeb is a low-cost, modular, open-standards-based, open source software platform that simplifies the development of top-quality .mobi applications and portals, providing an advanced content adaptation environment. It includes different modules which cover all the basic requirements that must fulfill a complete and integrated mobile web site, hiding applications all the complexity related to dealing with multiple delivery contexts. MyMobileWeb uses WURFL to recognize and obtain the capabilities of devices. As a value-added feature, MyMobileWeb incorporates some experimental modules capable of exploiting semantics in a mobile environment, implementing the concept of "Semantic Mobile Web".