I'd like to know if OSGi and Equinox have Eclipse plugins.
I'm trying to figure it out: are you asking for available eclipse plugins to help develop OSGi and Equinox applications?
If that was indeed the question, there's a base misconception of OSGi to correct: Eclipse is a specific application built on OSGi and any plugin developed for Eclipse is a particular case of an OSGi bundle. OSGi is a base infrastructure for packaging, building and distributing applications.
Eclipse, Equinox and OSGi are much more than simply related: actually they're integrated into each other