Current status as of 3/26/2018
carbon-cr-6.1, xenonhd-o compile and are being maintained.
aicp-o8.1 and aokp-oreo compile but are now inactive.
nitrogen-o2 fails to load kernel.
du-o8x-caf has no RIL/Gestures/stuff because the vendor tree is just copied and renamed files from potter.
Currently working to fix the kernel for nitrogen-o2, but I might be doing something else before I update this again.