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 - [søstr](https://github.com/metasikander/s0str)![stars](https://img.shields.io/github/stars/metasikander/s0str.svg?style=social) – a private nostr relay written in rust, saves all notes from one pubkey and publish them to anyone that requests them
 - [knostr](https://github.com/lpicanco/knostr)![stars](https://img.shields.io/github/stars/lpicanco/knostr.svg?style=social) – a nostr relay implemented in Kotlin with support for Postgres and metrics(micrometer).
 - [PyRelay](https://github.com/johnny423/pyrelay) ![stars](https://img.shields.io/github/stars/johnny423/pyrelay.svg?style=social) – a python implementation of a nostr relay, using asyncio.
+- [strfry](https://github.com/hoytech/strfry) ![stars](https://img.shields.io/github/stars/hoytech/strfry.svg?style=social) – C++ implementation backed by LMDB with efficient syncing of events using merkle trees
 
 ### Instances