Huegli Tech
Huegli Tech, the engine and genset control company.
http://www.huegli-tech.com

American Marine Oil Systems
Design and manufacture 28' twin engine cat-hull environmental service aluminum vessel for boat to boat services, marine oil and evacuation systems, and bilge and engine room steam cleaning systems.
http://www.americanmarineoil.com/index.htm

Engine Builder
Monthly business magazine serving the machine shop, custom engine, performance engine and production engine building markets.
http://www.engine-builder.com/index.htm

Concept Engine
Describes different engine design concepts, sorted by nation, as well as some support systems. Addresses efficiency and performance, insights, characteristics, with pictures and animations.
http://conceptengine.tripod.com/

Gas Turbine Training
Both engine maintenance and maintenance familiarization courses cover both engine hardware and systems.
http://www.gasturbinetraining.com/

Java Monkey Engine
A 3D game engine written in and for Java. Many features including collisions, particle systems, shaders, terrain system, renderer abstraction.
http://www.jmonkeyengine.com

The BUILD Engine Porting Project
A project to port the engine to Linux and win32 systems.
http://www.icculus.org/BUILD/

Wikipedia - Diesel Engine
Free encyclopedia article covers diesel engine technology and applications. Addresses technical and historical background, types and characteristics, support systems and parts.
http://en.wikipedia.org/wiki/Diesel_engines

Truevision3D
A 3D Engine, Media Engine and Net Engine for 3D game and application development using any major programming language.
http://www.truevision3d.com/

Wikipedia: Internal Combustion Engine
Free encyclopedia article covers internal combustion engine technology and applications. Addresses operation modes, thermodynamic cycle and efficiency, fuel types, support systems and parts.
http://en.wikipedia.org/wiki/Internal_combustion_engine