add 'netbox'

- signed-off-by: trimstray <trimstray@gmail.com>

README.md

@@ -613,6 +613,7 @@ performance of any of your sites from across the globe.<br>
 
 <p>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.capanalysis.net/ca/"><b>CapAnalysis</b></a> - web visual tool to analyze large amounts of captured network traffic (PCAP analyzer).<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/digitalocean/netbox"><b>netbox</b></a> - IP address management (IPAM) and data center infrastructure management (DCIM) tool.<br>
 </p>
 
 ##### :black_small_square: Labs