Password managers - Software that generates strong passwords and stores them, usually encrypted. KeePass for example
2FA code - 2 factor authentication. Usually an text message (sms) that gets sent to your phone that you need to enter in order to access the service. Just an additional layer of security on your account.
User agent switcher- I'm assuming this is browser software designer to make it easier for you to look like a different person so a website doesn't recognize you.
Multifactor authentication- same as 2fa, possibly has more than 1 layer though. Like a code gets sent to your email and phone number
Audiophiles- somebody with a good ear, able to hear flaws in bad copies of audio better than most people.
Account collectors - people who sign up to every
tracker they can get their hands on
Bulk download- downloading heaps at the same time