access to contacts for several people to be able to change

I coach a local team and would like for my 2 parent reps to be able to access all of my contacts, but I would also like to have them available. They will be in charge of updating it and mailing out certain things, but I also need the ability to view the current info if i need to contact a kid.

i remember something about a site for projects that was free and had all sorts of collaboration stuff. i thought it was backpack or something. Anyway Anyone know of such a site that would allow this?

Thanks