Ask HN: How do you share passwords simply and securely?

I saw lots of password sharing (especially at work, between family members or friends, purposely or non purposely) with plain text in the wiki, or restricted permission of doc.

Are there existing tools (or non-existing tools) that can simplify password sharing experience securely?

(Password manager seems a way of securely sharing password, but it usually requires registration and is guarded behind a paywall. Not simple enough IMHO)