I came across Pass when I was looking for a password manager a while ago. I don't use it, but it is responsible for the idea behind my super simple workflow.

I have a folder, ~/pass. It contains gpg encrypted text files. They are named by category. So, a product key would be keys.ftl.gpg. A website would be sites.hackernews.gpg.

I create and edit files with emacs. It handles gpg files and lets you choose which key to use to encrypt.

For random password generation, I use pwgen.

That's it. Being files, you can ls and grep to see if you already have an account somewhere or find out the file name that belongs to a site. If you are concerned with "giving away" where you have accounts if the system is compromised, you can create larger generic files like "sites" and then use your text editor to search through them.

It's simple, easy to backup via rsync and cross platform because gpg, emacs and pwgen are on every platform. When the SSD in my Linux machine failed I was stuck using Windows for a month while the RMA went through. It was trivial to get up and running with cygwin.