Multi-Engine Resources

I’ve been reading up on Multi-Engine flying. I’m now familiar with terms like critical engine, p-factor, and asymmetrical thrust.

I’m looking for more detailed information. My normal web resources have come up short. Admititly I haven’t looked at any resources at Transport Canada yet.

Does anyone have any good (free) resources that contain information about flying complex aircraft and IFR related info. I already have a copy of the Instrument Procedures Handbook.