Even off the free tier, S3 + Cloudfront is now my static host of choice. Incredibly cheap for my low traffic side projects and free (and instant) SSL certificate setup.
now they are static sites built with grunt. Before they were dynamic so the documentation and tests could be joined and runned dynamically. Now I just do that before push, which had me change the organization of few things. I converted them and I'm now hosting them in Github Pages for that same reason. I learned a lot about grunt, phantomjs and SSL with cloudflare on the process though, so I'm happy with the result.