Skatepark Guide

Resource for designing and building concrete skate parks and portable ramp kit parks. Skate park guide book and CD ROM available.
http://www.skateparkguide.com/

Build a Modular Halfpipe

Provides free instructions on how to build a halfpipe with step by step plans, photos and needed materials.
http://modular_halfpipe.tripod.com/

How to Build a Skate Ramp

Includes materials list, photos and brief instructions.
http://bestbuildskateramp.tripod.com/

Heckler Magazine

Detailed free ramp plans including funbox, pyramid, launch and various pipes.
http://www.heckler.com/ramps/

BMXTRIX: Building and Ramps

Provides summaries on templates, layering materials, and over a dozen plans for various types of ramps. Free plans and downloadable templates.
http://www.bmxtrix.com/how_to/build_ramps/

Ramp Plans Dot Org

A compliation of plans from all over the web with attrition, photos, FAQs, glossary, and related links. Also provides a message board with several topics.
http://rampplans.org/