Pro/ENGINEER is a 3D parametric solid modeling CAD package. The parametric features make modeling flexible, as models are able to change based on the modification of their parent parts and assemblies. Pro/E is a high end manufacturing CAD system that can range in price from a few thousand per seat for Foundation to $40k per seat with all the options. Modules include parts, assemblies, drawings, sheetmetal, surfacing, NC, piping, cabling, ecad, mold, weldments, and behavioral modeling (BMX). There are a host of different PDM systems to help you manage Pro/E files.
Free Pro/E resources, downloads, tutorials, and presentations. Home of the Trail File Wizard. ProE to PDF Scripts, Trail file shell scripts, and ProPDM tips sheets. http://www.cadjobs.net/resources/index.html
Pro/ENGINEER Automation Applications for manipulating Pro/E via MS-Excel, Databases and XML. Custom Editors for Pro/PROGRAM, and in-Session Batch Export and Processing Utilities. http://www.buydesignautomation.com
ModelCHECK is an add-on CAD software tool that evaluates Pro/ENGINEER part, assembly, and drawing models for quality and will check to ensure that a company's standards and best-practices are being adhered to. http://www.ptc.com/products/proe/modelcheck.htm
Independent discussion forum about PTC's Pro/ENGINEER Routed Systems Designer. RSD is a multi discipline schematic diagram Pro/ENGINEER option, that can also be used standalone. http://www.rsdesigner.net/