First, I’d like to say that any knife has the potential to be a good rescue tool. Any knife. If you have a blade on you, you’re already 90% ahead of anyone else who might stop to see if they can help–Unless you live in one of those areas where going out without a knife...
The following are some of the best examples for anybody with gloved hands that needs an easy opener, such as the military, police, firefighters, etc. Read the knife overviews and see the comparison table at the end for specifications...