Energy
- 521
 - Flashsteam
 - Development project of a four stroke, direct injection, steam engine. Includes thermodynamics basics, project description, pictures and videos.
 
- 522
 - Stirling Engine
 - Comprehensive information resource about the technology. Includes history, basics, models, plans, gallery, links, and an overview of a rotary displacer engine. [English, Japanese]
 
- 523
 - American Stirling Company
 - Manufacturer of educational models, fans, hand heated and full power engines. Includes forum, FAQs and insights on the technology.
 
- 524
 - Genoa Stirling
 - Describes the design steps and insights of a full scale engine. Includes videos, technical datasheets, test results, work in progress and links.
 
- 525
 - HowStuffWorks - How Stirling Engines Work
 - Describes the thermodynamic cycle. Includes several animated diagrams.
 
- 526
 - Wikipedia - Stirling Engine
 - Free encyclopedia article covers engine technology. Addresses historical and technical background, engine efficiency, thermodynamic aspects and applications.
 
- 527
 - Solar Stirling-Engine Water Pump Proposal Draft
 - Design proposal of a Stirling based pump design. [PDF] (November 29, 2005)
 
- 528
 - European Fuel Cell Forum
 - A private initiative event discussing fuel cells. Lists speakers, topics to be covered, current and past events, and reports.
 
- 529
 - Fuel Cell Today
 - News stories covering global fuel cell industry added daily; also offers regular commentary on industry developments. Users can subscribe to free newsletter.
 
- 530
 - FuelCell Works News and Info
 - Provides links to fuel cell companies and alternative energy news stories.
 
- 531
 - Hydrogen Cars
 - Resource featuring concept cars, hydrogen highway, fuel cell technology, engines, production and infrastructure issues.
 
- 532
 - Penn Engineers Develop Fuel Cell That Uses Liquid Diesel
 - Chemical engineers at the University of Pennsylvania have developed a prototype fuel cell that runs on ordinary diesel fuel. (September 06, 2001)
 
- 533
 - Fuel Cell Europe
 - A trade association that seeks to accelerate the development and market uptake of fuel cells technology. Site provides technical information, links, papers and presentations.
 
- 534
 - Fuel Cell Institute of Australia
 - Membership organization designed to help establish hydrogen and fuel cell industries within Australia.
 
- 535
 - Fuel Cells UK Industry Association
 - Acts on behalf of UK fuel cell stakeholders to accelerate the development and commercialization of fuel cells. Information about activities and membership, and current member listing.
 
- 536
 - Advanced Measurements
 - Supplier of custom test and measurement solutions to fuel cell developers, manufacturers and research organizations.
 
- 537
 - Humidicore
 - Humidicore is a fuel cell lightweight, inexpensive humidifier. Replaces aftercooler, condenser and humidifier and runs on waste heat. Made with commercially available components.
 
- 538
 - Sensor Products, Inc.
 - Introduced the Topaq pressure analysis system. Aids in ensuring accurate interfacial spacing and membrane placement in a fuel cell stack.
 
