交互式球面几何软件Spherical Easel

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维基Lénárt sphere
官网Spherical Easel An interactive app for exploring spherical geometry
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数值测量长度、距离、角度和面积。创建用户自定义的计算以探索球面几何猜想。
使用切线、二等分法等轻松构造点、线、圆和圆锥。

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TriSph A free software to solve the spherical triangles, configurable to different practical applications and configured for gnomonic

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Online computation of spherical triangles From 4 input quantities of a spherical triangle all other quantities are computed, optionally including an Error propagation. If two solutions exist, both are computed.