FreePlay is fairly well known for a wide range of human powered radios and flashlights. Things that may be quite handy on a boat or in a camping situation away from "shore power". If you are still going, then the light can be 🙂
A product that I hadn’t seen is their FreeCharge Weza Portable Energy Source. Its a fairly basic gel-cell lead acid battery pack that can be used to power accessories or to jump off a vehicle. It will accept 110V-220V AC and 13-21V DC input for charging (solar, wind, etc.) and if needs must, then there is a foot pedal and you can "pump" it until you have enough juice to get what you need done.
This is a slick idea and might be a good fallback item on my boat. It’s not going to power the propulsion motor (for long, anyhow), but it might help in getting a small generator started, or just to power accessories. Output is 3-12V DC. The fact that it weights in at less than 20 lbs. is nice also.