To be clear though: by E2EE here I mean browser-side encryption with zero-knowledge on the server side.

Etherpad is still encrypted in transit with https; only the server can snoop.

Cryptpad and other web-based E2EE services can still be completely compromised server-side by serving malicious code to the browser, and practically the user would never know.

Cryptpad:

• Full-on google docs / office365 / libreoffice type replacement with collaboration.
• E2EE
• The complexity means it doesn’t work well on mobile, takes a while to load on a slow connection, more frequent bugs. (3.5 MiB page transfer)
• Self-hosting is complicated.

Etherpad:

• A competent collaborative rich-text editor. Doesn’t do spreadsheets or presentations or […].
• Not E2EE (you need to trust that the server a bit more).
• Lightweight, works on slower connections, works alright on mobile. (1.7 MiB page transfer)
• Self-hosting quite simple.

PrivateBin:

• Super-simple plain-text/markdown pastebin. No editing possible once saved.
• E2EE
• Very small. Works fine on slow connections and mobile. (0.2 MiB page transfer)
• Self-hosting very simple.