Update source_code.md

source_code.md

@@ -258,21 +258,33 @@ Backend: closed-source
    GNU Social: https://gnu.io/source/
 
 ## Domain Name System (DNS)
- Njalla: Non-free/Proprietary Software
+Njalla: Non-free/Proprietary Software
+
+DNSCrypt: https://github.com/dnscrypt
 
- DNSCrypt: https://github.com/dnscrypt
 DNSCrypt-proxy: https://github.com/jedisct1/dnscrypt-proxy/
 
- OpenNic: https://github.com/opennic/ (mostly)
+OpenNic: https://github.com/opennic/ (mostly)
+
 Webpage: https://github.com/opennic/opennic-web
 
-  Worth Mentioning
+Worth Mentioning
 
-   NoTrack: https://github.com/quidsup/notrack
+NoTrack: https://github.com/quidsup/notrack
 
-   Namecoin: https://github.com/namecoin
+Namecoin: https://github.com/namecoin
 
-   Pi-hole: https://github.com/pi-hole
+Pi-hole: https://github.com/pi-hole
+
+## Encrypted ICANN DNS Providers
+
+AdGuard DNS: https://github.com/AdguardTeam/AdGuardDNS/
+
+BlahDNS: https://github.com/ookangzheng/blahdns/
+
+CloudFlare DNS: https://github.com/cloudflare/dns
+
+PowerDNS: https://github.com/PowerDNS/pdns
 
 ## Digital Notebook
  Joplin: https://github.com/laurent22/joplin