I immediately recognized the name OTI, because I had seen it in some early articles about SWT, which is now the cross-platform UI toolkit of Eclipse. So, was SWT also originally implemented in Smalltalk? Or did it come after the transition to Java?
I don't know about the internals. But OTI developed Visual Age for Smalltalk and other VA for X products such VA for Java. They were all written mostly in Smalltalk, including VAJ (very interesting! It was a VM that ran both Smalltalk and Java).
Eclipse was supposed to be inherited from VAJ, but having used Eclipse in its early days, I didn't see much resemblance..
