[wuster]

I want to also vote up Cactus despite the lack of attention paid to it lately. IMO it's very well designed and deserves to be worked on by a wider community.

It's open sourced via BSD 3 clause: https://github.com/koenbok/cactus

I especially liked the "deploy to s3" feature, IMO the cheapest way to run a highly scalable static site today.

Alternatively, a "deploy to GitHub page" would be neat as well.

I would work on extending Cactus if it was a bigger problem personally, but so far what's released fits my needs already.