Updates blog

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
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