Tektronix
Keithley
National Instruments
Delorenzo
Ametek
Digilent (An NI Company)
Telestream(Tektronix Video)
Harmonic
Streambox
Digital nirvana
Newtec
Utah Scientific
Apantac
DekTec
paneda
norwia
RFS Radio Frequency Systems
Tag
Netinsight
Dev
Irdeto
Netscout
Viavi Solutions
Sumitomo
Spirent
Pba
ROHDE&SCHWARZ
RFS RAdio Frequency Systems
SevOne
Efficient IP
A10
netAlly
ADVA
Tencent
cellex
GSMK
Microtel Innovation
ZCTT
Calnex

GPIB (IEEE 488)

NI GPIB (IEEE 488) hardware and software offer three key benefits - improved performance, high reliability, and increased productivity - that can help you save time and money throughout the life of your instrument control system from development through production and maintenance. 

Series
Plug-In Controllers 
Series Interface  
NI PCI-GPIB PCI More detail
NI PCIe-GPIB PCI Express More detail

External Controllers 
Series Interface  
GPIB-USB-HS USB More detail
GPIB-ENET/1000 Ethernet More detail
GPIB-RS232 RS232 More detail