web2py deserves a place on the list. I've found it to be more productive than django.
web2py both (a) sounds way way too much like web.py, which predated it, and (b) it sounds like it's a successor to it -- which it is not, and (c) sounds like it's a conversion tool of some kind (following the whole "foo2bar" pattern in program naming).
Whereas 'gluon': some small thing which binds the universe together. And it has personality!