Scopalamine patches for motion sickness.
Oh, and this:
A few years ago I was watching one of those numerous programs detailing the lunar landings, and that night I stepped outside and took a look at the full moon. And rather than seeming that it was just a little higher than the airliners flew, I actually had a feel for how far the moon was. I mean, it's one thing to "know" it's 384,000 clicks away, but it's another thing to really understand that. It was a satori, a moment of clear thinking.
Does that count as a benefit of the moon landings? Maybe not worth 10% of America's GNP for eleven years, but still...
Orbital rendezvous techniques were developped in the Gemini program but ultimately meant for Apollo so I guess it counts.
Fly-by-wire tech was used by Avro Canada for the CF-105 "Arrow" fighter-interceptor in the late 1950's (the project was cancelled shortly after Sputnik). I don't know if they invented it or not, but it was invented and in use in aircraft before manned spaceflight. As an interesting crossover, there was a plan to create a variant of the Arrow where the missile bay was replaced by a launch bay for a rocket for launching small payloads to orbit!