Freemo modules are becoming increasingly popular in the United Kingdom and we have standards for N, HO, On30 and soon O scale 2 rail. Meets occur across the country but mostly in England and Wales. In 2018 I hope to help organise the first meet in Scotland so having aquired some secondhand part finished modules I intend to finish these and possible build some more modules in the future.
The NMRABR Freemo Spec can be found here https://www.nmrabr.org.uk/nmra-ho-modules-spec
I am also working with others to produce our first Freemo O scale 2 rail spec, this would be very similar to the HO scale specification the only differences would be the radius and the rail type. Hopefully some modules can be built to O scale specification later in 2018.
Gordy's | Model Railroads 