Can anyone recommend a good laser diode that won't cause damage to the eye with prolonged exposure?
What is the application? Will users be wearing protective eyewear?
Lasers are used by eye surgeons to reattach detached retinas.
Apart from this and unless you are already an eye surgeon, the only safe laser to put anywhere near your eyes is one with no power applied to it.
If you do look at a laser, at least keep one eye closed, so that you will not be totally blind afterwards.
Well, what types of lights are used in things like commercially available laser tag systems that won't cause eye damage?
Google is our friend. I googled laser tag eye safety, and the first hit has the answer:
Separate names with a comma.