A "standard" library for PowerShell inspired by the preludes of other languages

Cross-platform (Windows, Linux, Mac) 3D tools for PowerShell. http://www.davidlenihan.com/category/ddd/

PowerShell Math and Statistics Library is a collection of math and statistics classes and cmdlets for PowerShell. It is built on top of Accord.NET (http://accord-framework.net/). This is a work in progress, but already usable for many use cases. For more details, see https://github.com/horker/psmath