Codefol.io
Periodically I rewrite Codefol.io in something vaguely-modern and attempt to adapt the old content. It's... a good exercise?
My last rewrite was into Octopress with Octostrap, which wasn't bad. It's definitely showing its age, though.
Middleman is a lot cleaner and simpler, which means I'll have to configure the hell out of it to get what I want... But it may be easier to do the next adaptation in a few years? And I can use Bootstrap manually rather than in a preconfigured way, which is probably a good idea. It'll also let me use a reasonably modern Bootstrap - it's improved a fair bit.