iroh establishes direct connections whenever possible, falling back to relay servers if necessary. Get fast, efficient, reliable connections that are authenticated and encrypted end-to-end using QUIC.

• GitHub - n0-computer/iroh: IP addresses break, dial keys instead. A library that adds QUIC + NAT Traversal to your apps. · GitHub

An open-source implementation of the Messaging Layer Security protocol

OpenMLS is a software library that can serve as a building block in applications that require end-to-end encryption of messages.
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It has a safe and easy-to-use interface that hides the complexity of the underlying cryptographic operations.

• OpenMLS Book