OpenVSP (Vehicle Sketch Pad) is a parametric aircraft geometry tool. OpenVSP allows the user to create a 3D model of an aircraft defined by common engineering parameters. This model can be processed into formats suitable for engineering analysis. VSP allows even novices to quickly become proficient in defining three-dimensional, watertight aircraft geometry.

The predecessors to OpenVSP have been developed by J.R. Gloudemans and others for NASA since the early 1990's. On January 10 2012, OpenVSP was released as an open source project under the NASA Open Source Agreement (NOSA) version 1.3.

Windows, Mac or Linux versions are available here.

A set of video tutorials can be viewed here.