Server software
software providing a (network or IPC) service
Maelstrom
proxy server
web server
print server
Music Player Daemon
game server
pump.io
display server
Twister
Ghost
streaming server
e-mail server
time server
map server
Skype for Business Server
network access server
Known
GNU social
BitTorrent tracker
Microsoft Endpoint Configuration Manager
Apache Wave
Mastodon
Apache Roller
Kea
AEGIS
news server
C-Net DS2
file server
Internet Relay Chat daemon
Synapse
Dendrite
Pleroma
Slash
collaborative wiki software
NUTS
application server
terminal server
database server
Zend Server
mail transfer agent
Movable Type