K5
Kaleidoscope
Kali
KAP
Karel
KBMS
KCL
K-code
KEE
Kernel Parlog
Kevo
KFX
Kid
KISS
KL0
KL1
Klerer-May System
KL-ONE
KLS
KMODEL
KOMPILER
KRC
KRL
KRS
KRYPTON
Ksh