Every single major operating-system vendor supports and supplies it. The essential nature of commercial software is anonymity.
Commercial concerns look for more in a system than just programming elegance.
As a language, Motif does show its age. However, that doesn't make a hoot of difference when you have an end product to produce. Motif Programming Manual , part of O'Reilly's X Window series. In this recent interview with O'Reilly Web Reporter Lori Houston, Fountain champions the prevailing benefits of Motif and compares it to newer, higher profile toolkits. Although it seems to have been around forever, Motif has become the prima facie native toolkit on Unix.