@WA4OSH – the closest thing I know of to a list of decoders is this directory in the gr-satnogs repo, which has the GNU Radio flowgraphs for the out-of-tree module. You can see that there are files for FOX telemetry, Morse, AX25 and so on. However, maybe someone else from the project can give a better answer? (/cc @fredy / @pierros)
CW decoding in particular is a work in progress; you can probably get the latest status by asking in Matrix/IRC, but I have the impression it’s changing quickly.
Thanks again for adding all this to the wiki!