Services: signal server and software repositories

services.mdwn

@@ -27,6 +27,7 @@ Misc:
 * [Rocket.Chat](https://rocket.chat/#!).
 * [Mattermost](https://about.mattermost.com/).
 * [Riot. Break through.](https://riot.im/).
+* [Signal Server](https://github.com/whispersystems/signal-server).
 
 Jabber:
 
@@ -81,6 +82,7 @@ Infostructure
   * [simplesamlphp](http://packages.debian.org/stable/web/simplesamlphp).
 * Proxies and load balancing like [Deflect](http://wiki.deflect.ca).
 * [Ethereum Frontier](https://www.ethereum.org/).
+* Software repositories (apt, f-droid, etc).
 
 Social media
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