Devices not on recent versions with newer unofficial builds available:

himaul, currently 14.1:
https://forum.xda-developers.com/t/rom-11-0-0-himaul-himawl-lineageos-18-1-unofficial.4199175/
https://forum.xda-developers.com/t/rom-10-0-0-himaul-himawl-lineageos-17-1-unofficial.3994825/

m7, currently 14.1:
broken - https://forum.xda-developers.com/t/rom-11-0-unofficial-m7-all-lineageos-18-1-stable.4187799/
https://forum.xda-developers.com/t/rom-10-0-unofficial-m7-all-lineageos-17-1-stable.3969563/

bullhead, currently 15.1
missing source code - https://forum.xda-developers.com/t/rom-11-unofficial-lineageos-18-1-2021-08-09-discontinued.4318251/
https://forum.xda-developers.com/t/rom-unofficial-lineageos-17-1-blod-patched-2021-08-09.4049993/
https://forum.xda-developers.com/t/rom-kernel-unofficial-optimized-lineageos-17-1.4163495/

angler, currently 15.1
broken - https://forum.xda-developers.com/t/rom-unofficial-lineageos-18-1-for-nexus-6p-angler.4206397/
https://forum.xda-developers.com/t/rom-unofficial-lineageos-17-1-for-nexus-6p-angler.4012099/

dragon, currently 15.1
broken - https://forum.xda-developers.com/t/rom-unofficial-lineageos-18-1-dragon-2021-10-06.3591152/