Grav is in use on many production sites and their support is amazing. When I run into an issue they resolve it like I'm on a paid contract. I have a shared environment with one grav install and a dozen sites which is not a normal install. Here's a really simple blog: https://www.sendthemtomir.com/
One question to PyPy developers: CPython 3.5 [1] introduced math.gcd which uses Lehmer's algorithm [2], are there any plans to include it in PyPy, too?