Special registered accounts on Slackware.

passwd		id	group		id	owner		SlackBuilds.org
--------------- -------	--------------- ------- -------------------------------
root		0	root		0	Slackware
bin		1	bin		1	Slackware
daemon		2	daemon		2	Slackware
			sys		3	Slackware
adm		3	adm		4	Slackware
			tty		5	Slackware
			disk		6	Slackware
lp		4	lp		7	Slackware
			mem		8	Slackware
			kmem		9	Slackware
			wheel		10	Slackware
			floppy		11	Slackware
sync		5	root		0	Slackware
shutdown	6	root		0	Slackware
halt		7	root		0	Slackware
mail		8	mail		12	Slackware
news		9	news		13	Slackware
uucp		10	uucp		14	Slackware
			man		15	Slackware
			dialout		16	Slackware
			audio		17	Slackware
			video		18	Slackware
			cdrom		19	Slackware
			games		20	Slackware
			slocate		21	Slackware
			utmp		22	Slackware
operator	11	root		0	Slackware
games		12	users		100	Slackware
ftp		14	ftp		50	Slackware
smmsp		25	smmsp		25	Slackware
			tape		26	Slackware
mysql		27	mysql		27	Slackware
rpc		32	rpc		32	Slackware
sshd		33	sshd		33	Slackware
ntp		38	ntp		38	?
gdm		42	gdm		42	Slackware
			shadow		43	Slackware
oprofile	51	oprofile	51	Slackware
apache		80	apache		80	Slackware
messagebus	81	messagebus	81	Slackware
haldaemon	82	haldaemon	82	Slackware
			plugdev		83	Slackware
			power		84	Slackware
			netdev		86	Slackware
pop		90	pop		90	Slackware
hacluster	91	haclient	91	Me, heartbeat
			scanner		93	Slackware
			nobody		98	Slackware
nobody		99	nogroup		99	Slackware
			console		101	Slackware

postfix		201	postfix		201	Me, Postfix		200
			postdrop	202	Me, Postfix		201
clamav		203	clamav		203	Me, Clamav		210
dovecot		205	dovecot		205	Me, Dovecot		202
dovenull	206	dovenull	206	Me, Dovecot since 2.0	N/A
			cvsusers	206	Me
postgres	209	postgres	209	Slackbuilds
spamd		210	spamd		210	Me, Spamassasin
dspam		212	dspam		212	Me, Dspam
nagios		213	nagios		213	Me, Slackbuilds
vboxguest	215	vboxguest	215	Me, Virtualbox guest additions
vboxhost	215	vboxusers	215	Me, Virtualbox host user and users group
dbus		221	dbus		221	Me, only Slack 11.0
qemu		221				Me, since Slack 13.0
mediatomb       222     mediatomb       222     MediaTomb
miniddlna	222	minidlna	222	MiniDLNA
vdr             223     vdr             223     Me, Slackbuilds
radius		224	radius		224	freeradius
fuppes		225	fuppes		225	Me, fuppes
unbound		226	unbound		226	Me, unbound
zabbix		228	zabbix		228	Slackbuilds
openfire	265	openfire	265	Me, Slackbuild
munin		301	munin		301	Me
ossec           302     ossec           302     Me
ossecm          303     ossec           302     Me
ossecr          304     ossec           302     Me
asterisk	305	asterisk	305	Me
ejabberd	306	ejabberd	306	Me
mpd		307	mpd		307	Me
mosquitto	308	mosquitto	308	Me
openhab		309	openhab		309	Me
rspamd		310	rspamd		310	Me
domoticz	311	domoticz	311	Me
avahi           312     avahi           312     Me
avahi-autopid   313     avahi-autopid   313     Me
brewery		314	brewery		314	Me,brewery software

			domadmin	512	Samba
			domuser		513	Samba
			domguest	514	Samba
			domcomputer	515	Samba
			domcontroller	516	Samba
			dompolicyadm	520	Samba
			domprintadm	550	Samba

See also: http://slackbuilds.org/uid_gid.txt