Password Management Recommendations

Hi, I have about 70 users in my environment. In addition to our internal resources, we also use several hosted resources. This forces our users to have many different credential sets–usually between 3 and 6 different username and password sets. I need to find a solution so users don’t end up doing things like writing all their credentials on sticky notes.
Looking for a good corporate solution and would love to hear how other admins have approached this situation and which products they have found to work best.