Bitwarden
Open source password manager has a nice interface, easy search, and plenty of ways to organize your items.
Security
KeePass
Cross-platform software saves user names, passwords, urls, attachment and more in a single database. Entries are sorted in customizable groups, and there is an integrated search function.
Padlock
Open source app for storing passwords, serial numbers and other sensitive data — protected with one password. Available on all major platforms, with syncing between them.
Pastor
Pastor is a password-protected spot to stash serial numbers, passwords and the like. Once you get started, you’ll be amazed at how many you have. Keep them all in one, easy-to-find place instead of all over the place. Try KeePassX for a cross-platform alternative.