Copy of the recent announcement on the forge
The forge and related websites will be down for a few hours on 2018-10-30 starting at around 21:00 CEST.
I will do my best to keep the downtime as short as possible.
In the meantime, you can use the “static” website that has been put in place:
opam will fail to download data for some projects still hosted on forge.ocamlcore.org.