KTurtle is an educational programming environment for learning how to program. It provides all programming tools from its user interface.
KBruch
KBruch is a small program to practice calculating with fractions and percentages. Different exercises are provided for this purpose and you can use the learning mode to practice with fractions. The program checks the user’s input and gives feedback.
钙
Kalzium is a program that shows you the Periodic Table of Elements.
群星
Stellarium is a free open source planetarium for your computer.
康星
KStars is a Desktop Planetarium by KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time.
塞拉斯蒂娅
Celestia – real-time 3D visualization of space