Something to help teams rotate passwords on regular intervals. E.g. I want everyone to rotate their Heroku/Google Apps/Github/etc. passwords every 6 months, or

Something to help teams rotate passwords on regular intervals. E.g. I want everyone to rotate their Heroku/Google Apps/Github/etc. passwords every 6 months, or maybe after a major security event (like Heartbleed). Right now it means sending out a Google Doc for everyone to check off. Bonus points if it has some way of verifying that passwords were actually changed and the new password is strong.