LineageOS has started posting several experimental and nightly builds for various devices, including the Nexus 5X and Nexus 6P. The posting of the new software builds came as promised by the Lineage team and ironically keep Cyanogen elements in their versioning and naming conventions. Right now the downloads page has builds for the two Nexus’ but also for the Nextbit Robin, Motorola G4/G4 Plus and the Xiaomi Redmi 1S. Each build has the devices code name as part of the build name (Angler for the Nexus 6P for example) and the version numbering is what Cyanogen was using prior to their demise. Builds 14.1 in LineageOS are Android Nougat 7.1.
For each of these devices, all of the builds listed are either experimental, nightly, or both depending on the device. So if you have one of the supported phones and want to load the image to that
device, be fully aware that you are getting beta code. Expect issues so I highly recommend not putting this on your primary, daily driver phone. This, of course, will change as the LineageOS team and testers squash bugs and there will be stable builds in the future.
If you are interested in trying out one of the builds, head over to the LineageOS download page.