So we're all putting it here? Okay then. I agree with pretty-much everything hiro said this time.
Regarding differences between forks, what springs to my mind is the fixes 9front needed to host cat-v.org. The site was switched to a 9front server at the time of Uriel's death, news of which triggered a huge traffic increase for a while. It was evident that no-one had put Plan 9 under that kind of load before, or if they had, they hadn't released their fixes. I remember someone saying, "Everyone who used Plan 9 seriously must have maintained their own fork." Hosting cat-v.org may be unusual load. Web server and CMS are both a lot of shell scripts, so there is a lot of pipes and new processes all the time. 9front has received more fixes relating to hosting it over the years. There was also a change to factotum to prevent it deadlocking the filesystem. I don't remember what triggered that bug! Plenty of other stuff, but I'm out of time to write (for once). I have no idea if any other forks picked up any of the changes, although I'm sure 9atom has its own fixes particularly related to NAS work.
