The most popular BARRACUDA products:

F600
NG FIREWALL 5.0 (RELEASE NOTES)
BARRACUDA NG FIREWALL
BARRACUDA SSL VPN
F400 (INSTALLATION REV 1 4)
COMMAND LINE REV 1.1
EMAIL SECURITY SERVICE (ADMINISTRATOR GUIDE V1 0)
VF1000
F300 APPLIANCE REV 1.1
NG FIREWALL (COMMAND LINE INTERFACE GUIDE REV 1 3)
MESSAGE ARCHIVER
F101
WEB FILTERING SERVICE
C610 APPLIANCE REV 1.1
SPAM AND VIRUS FIREWALL 5.0
EMAIL SECURITY
WEB FILTERING SERVICE ( ADMINISTRATORS GUIDE)
VF100 (REV 1 2)
NG FIREWALL 5.0.1 (RELEASE AND MIGRATION NOTES REV 1 4)
VF500
VIRUS FIREWALL 4.X
F900 APPLIANCE 4.2.13
SPAM VIRUS FIREWALL OUTBOUND 3.5.X
F100
EMAIL SECURITY SERVICE
F10
VC610
WEB APPLICATION FIREWALL
C400
SPAM 4.0
F100 APPLIANCE 4.2.13
C400 APPLIANCE REV 1.1
F400
LOAD BALANCER WITH MICROSOFT LYNC SERVER 2010
VF1000 (REV 1 2)
VF50
VF50 (REV 1 2)
F800 APPLIANCE REV 1.1
CONTROL CENTER
F301
VC820 (REV 1 2)
NG FIREWALL 4.2.14 (RELEASE AND MIGRATION NOTES REV 1 5)
VF250
PUREWIRE WEB SECURITY SERVICE (QUICK START GUIDE)
F301 APPLIANCE REV 1.1
SPAM VIRUS FIREWALL 4.X ADMINISTRATOR GUIDE
F200
F300
F400 APPLIANCE REV 1.1
BARRACUDA WEB APPLICATION FIREWALL
VF100
F900
NG FIREWALL 5.0.1
F10 APPLIANCE REV 1.1
NG FIREWALL
SPAM AND VIRUS FIREWALL
F800
BARRACUDA WEB APPLICATION FIREWALL (BARRACUDA SYSLOG)
SPAM 4.X
VC400 (REV 1 2)
F201 APPLIANCE REV 1.1
NG FIREWALL (TRAFFIC SHAPING)
VF500 (REV 1 2)
VC610 (REV 1 2)
NG FIREWALL 4.2.14
VC820
PUREWIRE WEB SECURITY SERVICE
F200 APPLIANCE REV 1.1
BARRACUDA MESSAGE ARCHIVER
WEB FILTER
F600 APPLIANCE REV 1.1
BARRACUDA SPAM AND VIRUS FIREWALL V4
NG FIREWALL 4.2.13
WEB APPLICATION FIREWALL (QUICK START GUIDE)
VPN CLIENT FOR LINUX-MAC OS-OPENBSD
NG FIREWALL 5.0
C610
WEB APPLICATION FIREWALL (SYSLOG)
F201
SPAM VIRUS FIREWALL V4.1 ADMINISTRATOR GUIDE
NETWORKS
WEB FILTERING SERVICE (QUICK START GUIDE)
F101 APPLIANCE 4.2.13
SSL VPN (TECHNICAL NOTES)
VF250 (REV 1 2)
VIRUS FIREWALL 4.0
VIRTUAL APPLIANCES
VC400
NETWORKS (TECHNICAL NOTES DEPLOYING THE BARRACUDA LOAD BALANCER WITH EXCHANGE 2010)
SSL VPN