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The backup mod to solve all your problems - actively maintained for almost any minecraft version!

JustTPA is a simple tpa plugin where players can ask other players if they can teleport to them.

SimpleLogin is a plugin/mod that provides a secure login and registration system. It uses SQLite for storage, BCrypt for password hashing, and supports optional TOTP-based 2FA for added account security.

Interesting and funny, but pretty complete, with blocks, items, structures, Easter eggs, dimensions—these are all imaginative ideas.