Add Nautilus, move Spritely, pubgate to Apps list

Watchlist-for-ActivityPub-developer-resources.md

@@ -46,12 +46,8 @@
 
 * ::heavy_check_mark: [**go-fed apcore**](https://github.com/go-fed/apcore) ([site](https://go-fed.org), [Fedi account](https://mastodon.technology/@cj)): A powerful single server ActivityPub framework for performant Fediverse applications. `AGPL-3.0, Go`
 
-* :heavy_check_mark: [**pubgate**](https://github.com/autogestion/pubgate):  Asyncronous lightweight ActivityPub API / CMS that implements both client-to-server and server-to-server APIs. Compatible with Mastodon, Pixelfed, Pleroma and microblog.pub `BSD-3-clause, Python`
-
 * :heavy_check_mark: [**Pubstrate**](https://gitlab.com/dustyweb/pubstrate): ActivityStreams and ActivityPub library implementation for GNU Guile. Includes a full ActivityStreams library and most of an ActivityPub implementation. `GPL-3.0, Guile`
 
-* :heavy_check_mark: [**Spritely**](https://gitlab.com/spritely) ([Fedi account](https://octodon.social/@cwebber)): Research space for a next-gen distributed social network written in Racket and consisting of multiple projects. Research conducted by AP specification writer Christopher Lemmer Webber. `Apache-2.0, Racket` 
-
 #### Plugins
 
 * :heavy_check_mark: [**ActivityPub for Drupal**](https://github.com/swentel/activitypub) ([Lead dev](https://github.com/swentel)): ActivityPub integration for Drupal 8 `GPL-2.0, PHP`
@@ -66,6 +62,8 @@
 
 * :heavy_check_mark: [**RSS-to-ActivityPub Converter**](https://github.com/dariusk/rss-to-activitypub): Convert any RSS feed to an ActivityPub actor that can be followed by users on ActivityPub-compliant social networks like Mastodon. `MIT, Javascript`
 
+* :heavy_check_mark: **[Nautilus](https://github.com/aaronpk/Nautilus)**: A standalone service to deliver posts from your own website to ActivityPub followers. `Apache-2.0, PHP`
+
 #### Utilities
 
 * [**tags-pub**](https://gitlab.com/evanp/tags-pub): Provides hashtag objects on the ActivityPub network. `Apache-2.0, Javascript`