Learn more about the JAMstack at JAMstack Conf in London — 9-10 July, 2019
I like the approach to managing a site taken by Jekyll. A lot.
I don't like Ruby, and I don't like strict logic-less templates. Jekyll is Ruby with Liquid as the templating engine.
Don't use Heckle at this point if you want something stable and finished. It's a work in progress, and may be radically changed or pitilessly abandoned at any time.