I use the minimalist pass UNIX utility to manage my passwords, logins, and other secrets (eg, bank routing numbers, crypto-currencies, padlock combinations) using GPG and git.

I use a tool named “browserpass” for partial integration in Chromium (the web browser I use).

The browser integration is read-only and does not work quite as smoothly as 1Password (a proprietary tool i’ve used at work in the past, which makes it easy to generate and store passwords/logins), but this setup is 95% of what I want, is way more hackable and feels more trustworthy, and is Free Software.