Grav is a fantastic new web CMS that's fast and flexible with a very gentle learning curve, and great documentation. We've been building site in Grav for our larger clients for a while now. All of our publicly available Grav products are on GitHub, but here's a list of the components that we've been able to open source:

Grav Stuff on GitHub

Plugins

• BigfootJS for Grav
  A Grav plugin that adds BigfootJS to your pages. You can read more about it (& see it in action) here.
• GoSquared for Grav
  A GRAV plugin that lets you easily add the GoSquared Analytics platform to your GRAV website - Read me is here.
• Pingdom RUM for Grav
  A GRAV plugin to provide support for Pingdom's Real User Monitoring scripts - Read me is here
• ChartJS for Grav
  A simple GRAV Shortcode plugin (i.e. it extends the Grav Shortcode plugin) that allows you to create simple charts using ChartJS. You can read a bit about it here, or the official Read me is here

Themes

• GrMassively — a Grav implementation of HTML5Up's Massively template, all aspects of this template are fully configurable from the Grav/Theme/GrMassively admin screens. If it looks familiar, that's because it's the theme being used on this site.