PrivateBin is self-hosted and open source pastebin software that deletes pasted text after a visit. It can be configured to not delete the paste after first view, at which point there is an option of commenting and replying to the paste, like on an Internet forum. All pastes on PrivateBin are encrypted with a password. The encryption is both during transport and at rest.
PrivateBin was forked from ZeroBin.
PrivateBin also supports: