bilgge is a free service which makes you feel as if you were storing data in a real safe house. instead of saying "it uses end-to-end encryption" then asking you 8+ characters password to protect your data, it gives you power to encrypt your data by yourself in your browser.
Nowadays, E2E is not enough to be a secure platform, a password could not project us at that all. This project is open-source so you may install on your VPS without trust anyone.
This is interesting. The "your browser does everything" stuff is a little misleading though. You do something. That something is presumably maintaining a database of encrypted hashes.
MossChat
Think Tutor