What is "ultramixer"

UltraMixer is a DJ Software for so called digital or virtual DJs, who are not using Vinyls or Audio-CDs but using digital music formats like MP3. UltraMixer is designed especially for the need of mobile DJs, who work as an entertainer for events like weddings, it is also used in dancing schools and restaurants. According to their website, it was the very first platform independent DJ Software for Windows, Mac OS and Linux. The software is being developed and distributed since 2003 by a company, in Dresden that is called UltraMixer Digital Audio Solutions GbR.