Add Pi-hole under 'Interesting Applications'.

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@@ -360,6 +360,8 @@ devices under a variety of operating systems.
 
 ## Interesting Applications
 
+* [Pi-hole](https://pi-hole.net/) is a network-wide DHCP server and ad blocker that runs on [Raspberry Pi](https://en.wikipedia.org/wiki/Raspberry_Pi). Pi-hole uses this repository as one of its sources.     This is a very interesting project to setup yourself, or you can [buy one pre-loaded](https://uk.pi-supply.com/products/pi-hole-kit-network-wide-ad-blocker).
+
 * [Block ads and malware via local BIND9 DNS server](https://github.com/mueller-ma/block-ads-via-dns "Block ads and malware via local DNS server") (for Debian, Raspbian & Ubuntu): Set up a local DNS server with a `/etc/bind/named.conf.blocked` file, sourced from here.
 
 * [Block ads, malware, and deploy parental controls via local DualServer DNS/DHCP server](https://scripttiger.github.io/dualserver "Block ads, malware, and deploy parental controls via local DualServer DNS/DHCP server") (for BSD, Windows & Linux): Set up a blacklist for everyone on your network using the power of the unified hosts reformatted for DualServer. And if you're on Windows, this project also maintains an update script to make updating DualServer's blacklist even easier.