more README.md updates

README.md

@@ -12,8 +12,43 @@ To configure chorus read [docs/CONFIG.md](docs/CONFIG.md)
 
 To undertand the relay's behavior, read [docs/BEHAVIOR.md](docs/BEHAVIOR.md)
 
+To understand command line tools, read [docs/TOOLS.md](docs/TOOLS.md)
+
 Chorus does not have any provisions for charging users.
 
+Chorus does not have any provisions for synchronizing events with other relays outside of the nostr protocol.
+
+## Alternatives
+
+### strfry
+
+[strfry](https://github.com/hoytech/strfry) is a more mature relay that offers additional features including:
+
+- Synchronizing events with other relays efficiently (negentropy)
+- Zero-downtime restarts
+- Websocket permessage-deflate
+- Plugins for event sifting
+
+However:
+
+- Chorus is probably faster (more efficient)
+- Chorus has personal relay rules by default
+- Chorus has extensive IP banning to protect your relay from abuse
+- Chorus supports NIP-42 (AUTH), NIP-59 (GiftWrap), NIP-65 (Relay Lists) and PR 1030.
+- Chorus has a moderation tool
+
+### nostream
+
+[nostream](https://github.com/Cameri/nostream)
+
+### nostr-rs-relay
+
+[nostr-rs-relay](https://git.sr.ht/~gheartsfield/nostr-rs-relay)
+
+### khatru
+
+[khatru](https://github.com/fiatjaf/khatru)
+
 ## Change Log
 
 ### Version 1.3.0 (2024-04-10, 7883d754)