Update non-free.md

Self hosted features of Remote Utilities are documented here: 

https://www.remoteutilities.com/solutions/self-hosted-server.php
https://www.remoteutilities.com/support/docs/about-ru-server/

non-free.md

@@ -104,3 +104,6 @@
 ## Remote Support
 
  * [ScreenConnect](https://www.screenconnect.com/) `⊘ Proprietary` - ScreenConnect offers lightning-fast remote support and remote access to connect instantly and solve problems faster.
+ * [RemoteUtilities](https://www.remoteutilities.com/) `⊘ Proprietary` - Remote Utilities is self-hosted remote support software for LAN administration and remote support over the Internet.
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