Well, Django is perhaps the most famous example of people writing their own: http://docs.djangoproject.com/en/dev/faq/general/#why-does-this-project-exist http

Well, Django is perhaps the most famous example of people writing their own: http://docs.djangoproject.com/en/dev/faq/general/#why-does-this-project-exist http://docs.djangoproject.com/en/dev/faq/general/#why-does-t... But I still see it a lot, there's a lot of "not invented here" or "none of the existing frameworks do exactly what we want".