OpenBoard
OpenCPN
OpenUniverse Space Simulator
OptGeo
OpticalRayTracer
Oregano
ulcc
GoldenDict
Artikulate
Blinken
Cantor
GCompris
KAlgebra
KAlgebra Mobile
Kalzium
Kanagram
KBibTeX
KBruch
KGeography
KHangMan
Kig
Kiten