Recs.
Updated
Simple password manager without any proprietary/closed formats. Passwords are kept in gpg-encrypted text files.
SpecsUpdate
Pros
Pro Ultra portable
As it has both git support and encrypts passwords to GPG-encrypted text files, it is really simple to access everywhere. You can either use a self hosted or a personal cloud hosted git repository. It is automatically being kept up-to-date. Clients for pretty much everything and a really active community. Even if you can't run a client you will still be able to access the password by decrypting them from the git store.
Pro Can store other information not just passwords
Password files are simply encrypted text files and can contain any information. Credit card numbers, expiry dates and ccv numbers, software licenses, social security numbers, etc. The first line of the file is interpreted as the password and is treated differently to the rest of the file (e.g., captured to clipboard with -c flag).
Pro Support for extra functionality via plugins
For example the plugin "pass-extension-tail" makes it possible to only display the non-password parts of a password file, like the username or the name of the service the password is needed for, and without showing the password. pass-otp plugin provides one-time-password functionality. pass-update plugin adds functionality to readout (or copy to clipboard) existing password and then provide option to generate a new one. Many more.
Pro Seamless integration with qutebrowser
Cons
Con Slight downside, the names of your credentials (website name or URL usually) may be visible to others
While the contents of your credential files (one stored per site) are never visible without your GPG key and its passphrase, the names of the files are visible unless you use a plugin like pass-tomb or software like TrueCrypt/VeraCrypt or LUKS to encrypt the folder and/or your home directory.
Con Exposes the names of the sites
By default each file is named 'google.com.gpg' - so someone who steals your password directory would know every site you have accounts on.
Can be mitigated with plugins like Tomb, but a noteworthy caveat.