The idea behind this piece is to collect any open source web development coding frameworks regardless of the scripting language used. Here are few to get the thing going and give you an idea as what may yet come.
If one of the above publishing platforms is too restrictive for you, then this might suit. Apparently, it’s effectively a CMS construction kit. I have yet to give it a look but that may change. If there’s any caveat, it’s that it uses Python as its scripting language and that may not be available with every web hosting package. Other than that, it should be fine.
It’s billed as a web application framework but there’s content management there too. All in all, this modularised PHP/MySQL driven offering probably needs checking out before being defined more explicitly.