yellowTAB was a German software firm that produced an operating system called "yellowTAB ZETA". While the operating system was based on BeOS 5.1.0, the company never publicly confirmed that it has the BeOS source code or what their licensing agreement with BeOS's owners PalmSource was. The company went insolvent and ceased trading in 2006. Later, David Schlesinger, directory of Open Source technologies at ACCESS, Inc., which had meanwhile become the owner of the BeOS source code, stated that there had never been a license agreement covering yellowTAB's use of the source code and that ZETA was therefore a pirated copy.

yellowTAB GmbH war ein Softwarehersteller mit Sitz in Mannheim. Das Unternehmen ist insolvent. Bis Mai 2006 entwickelte und vertrieb yellowTAB das Betriebssystem ZETA, dabei wurde in besonderem Maße auf Partner wie den RTL-Teleshop und freenet.de gesetzt. Ende 2005 beschäftigte das Unternehmen etwa 30 Mitarbeiter.

magnussoft ZETA was een commercieel besturingssysteem dat zodanig is ontwikkeld dat het sneller werkt dan de meeste andere besturingssystemen, ZETA start op in slechts 15 seconden.

yellowTAB é uma empresa alemã, sediada em Mannheim, de software que produz um sistema operacional baseado no BeOS 4.51. Até hoje não confirmaram publicamente possuir o código fonte do BeOS ou qual é o seu acordo de licenciamento com os atuais donos do BeOS, a PalmSource, apesar disso, o acordo parece ter fundamentação legal, pelo menos na Alemanha. O nome do produto é yellowTAB Zeta.

YellowTAB es una empresa alemana de software que comercializaba una versión personalizada con diversas mejoras y aplicaciones extra de la última versión de BeOS desarrollada por Be, la versión 5.1 beta, de nombre código dan0.