Add CampaignChain as Hootsuite+Buffer alternative

README.md

@@ -139,6 +139,7 @@ Some [Content Management System](#content-management-systems-cms) solutions also
 - [Alltube](http://www.alltubedownload.net) - Web interface for [youtube-dl](https://github.com/rg3/youtube-dl), a program to download videos and audio from [more than 100 websites](https://rg3.github.io/youtube-dl/supportedsites.html). ([Demo](http://www.alltubedownload.net), [Source Code](https://github.com/Rudloff/alltube)) `GPL-3.0` `PHP`
 - [AmIUnique](https://amiunique.org/) - Learn how identifiable you are on the Internet (browser fingerprinting tool). ([Source Code](https://github.com/DIVERSIFY-project/amiunique)) `MIT` `Java`
 - [Beehive](https://github.com/muesli/beehive) - Flexible event and agent system, which allows you to create your own agents that perform automated tasks triggered by events and filters. `AGPL-3.0` `Go`
+- [CampaignChain](https://www.campaignchain.com/) - A marketing hub allowing to schedule posts on social media (a la Hootsuite+Buffer) and combine them with newsletter campaigns. ([Source Code](https://github.com/CampaignChain/campaignchain/tree/1.0)) `Apache 2.0` `PHP`
 - [CouchPotato](https://couchpota.to/) - CouchPotato is an automatic Video Library Manager for Movies. Automatic torrent/nzb searching, downloading, and processing at the qualities you want. ([Source Code](https://github.com/CouchPotato/CouchPotatoServer/)) `GPL-3.0` `Python`
 - [Episodes](https://github.com/guptachetan1997/Episodes) - `⚠` Self Hosted TV show Episode tracker and recommender built using django, bootstrap4. `MIT` `Python`
 - [feedmixer](https://github.com/cristoper/feedmixer) - FeedMixer is a WSGI (Python3) micro web service which takes a list of feed URLs and returns a new feed consisting of the most recent n entries from each given feed. (Returns Atom, RSS, or JSON) ([Demo](https://mretc.net/feedmixer/json?f=http://hnrss.org/newest&f=http://americancynic.net/atom.xml&n=1)) `WTFPL` `Python`