diff --git a/services.md b/services.md
index 2e34942f292cbe0e244ebb463fdc5c7aed24c383..842c1f4befca7d4a30dcf992316854ab0f927174 100644
--- a/services.md
+++ b/services.md
@@ -128,12 +128,13 @@ Social networking
 * [Sneer](https://github.com/klauswuestefeld/sneer).
 * [Noosfero](http://noosfero.org/).
 * [Mastodon](https://mastodon.social) ([public instances](https://instances.mastodon.xyz/)).
-* Democracia: [Liquid Democracy](https://wiki.piratenpartei.de/Liquid_Democracy) / [Liquid Feedback](http://liquidfeedback.org).
+* Democracy: [Liquid Democracy](https://wiki.piratenpartei.de/Liquid_Democracy) / [Liquid Feedback](http://liquidfeedback.org).
 * [Briar](http://briar.sourceforge.net).
 * [Twister](http://twister.net.co/).
 * [RedMatrix](https://redmatrix.me/).
 * [Hubzilla](http://hubzilla.org/).
 * [commento: A lightweight, open source, tracking-free comment engine alternative to Disqus](https://github.com/adtac/commento)
+* Calendar: [Demosphere](https://demosphere.net/en/content/download) with [browser extension](https://demosphere.net/en/content/browser-extension).
 
 Timebanking
 -----------