OpenSCAD

The Programmers Solid 3D CAD Modeller

General

BOSL

The Belfry OpenScad Library - A library of tools, shapes, and helpers to make OpenScad easier to use.

dotSCAD

Reduce the burden of 3D modeling in mathematics.

NopSCADlib

An ever expanding library of parts modelled in OpenSCAD useful for 3D printers and enclosures for electronics, etc.

BOLTS

BOLTS is an Open Library of Technical Specifications.