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 - [Ephemerelay](https://gitlab.com/soapbox-pub/ephemerelay)![stars](https://img.shields.io/gitlab/stars/soapbox-pub/ephemerelay.svg?style=social) - An in-memory Nostr relay that doesn't store data.
 - [gnost-relay](https://github.com/barkyq/gnost-relay) ![stars](https://img.shields.io/github/stars/barkyq/gnost-relay.svg?style=social) - nostr relay written in go backed by postgresql database.
 - [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).
+- [mapstr](https://mapstr.xyz/) - Find local businesses which accept BTC and add reviews to those businesses as a customer. Allows ability to receive Zaps for your reviews. You can also add Nostr notes with coordinates which allows them to be mapped to your location.
 - [me.untethr.nostr-relay](https://github.com/atdixon/me.untethr.nostr-relay)![stars](https://img.shields.io/github/stars/atdixon/me.untethr.nostr-relay.svg?style=social) - a relay written in Clojure
 - [Minds Nostr Relay](https://gitlab.com/minds/infrastructure/nostr-relay) - a relay for [Minds](https://www.minds.com), an open-source social network
   - [Minds Engine - Nostr](https://gitlab.com/minds/engine/-/tree/master/Core/Nostr) - relevant Minds API code for reading/writing Minds posts using Nostr