A partial list of Fediverse software in alphabetical order:

akkoma
bonfire
bookwyrm
calckey
castopod
diaspora
drupal (with plug-in)
epicyon
friendica
funkwhale
gancio
gitea
gnusocial
gotosocial
greatape
guppe
hubzilla
immers space
kbin
ktistec
lemmy
mastodon
misskey
mobilizon
nextcloud
owncast
peertube
pixelfed
pleroma
plume
prismo
rebased
smithereen
socialhome
streams
takahe
writefreely
wordpress (with plug-in)
zap