I have setup some mirrors for Redox OS, Kolibri OS, Haiku OS and Plan 9 OS.
Here are the links:
https://haiku.carteronline.net Haiku OS
https://kolibri.carteronline.net Kolibri OS
https://redox.carteronline.net Redox OS
https://plan9.carteronline.net/ Plan 9
Give it a day before using these to make sure everything is sorted out.