Not much of a standard on PC, other than being the way to produce Palm, Epoch and Symbian apps, until Nokia replaced it with Eclipse based tooling, Carbide.
Metrowerks stuck around a long time in the embedded space.
Eclipse was more of a phenomena in the Java/OO paradigm, but was often slow on older platforms. Still, many folks embraced the open ecosystem when it became popular.
Symbian was 10 years ahead of their time, and brought a lot of new paradigms to mobile. Leaving the master signing key on a reset device was a teachable moment for most folks. =3
It was a standard prior to the gcc getting mainstream recognition. =3