Step is an interactive physical simulator. It allows you to explore the physical world through simulations.
看
Kig is an interactive mathematics software for learning and teaching geometry.
计算
Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).
地理坐标
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