- add opnsense.org to list of open source projects

- remove m0n0wall project that has ended

Submitted by:	Chris Petrik
Reviewed by:	jgh@, wblock@
Differential Revision:	https://reviews.freebsd.org/D5528

en_US.ISO8859-1/books/handbook/introduction/chapter.xml

@@ -728,6 +728,19 @@
 	    with a PHP powered web interface.</para>
 	</listitem>
 
+	<listitem>
+	  <para><link
+	      xlink:href="http://www.opnsense.org/">OPNSense</link>
+	    <indexterm>
+	      <primary>OPNsense</primary>
+	    </indexterm> - OPNsense is an open source, easy-to-use and 
+	    easy-to-build FreeBSD based firewall and routing platform. 
+	    OPNsense includes most of the features available in expensive 
+	    commercial firewalls, and more in many cases. It brings the 
+	    rich feature set of commercial offerings with the benefits of 
+	    open and verifiable sources.</para>
+	</listitem>
+
 	<listitem>
 	  <para><link
 	      xlink:href="http://www.pcbsd.org/">PC-BSD</link>
@@ -749,17 +762,6 @@
 	    support.</para>
 	</listitem>
 
-	<listitem>
-	  <para><link
-	      xlink:href="http://m0n0.ch/wall/">m0n0wall</link>
-	    <indexterm>
-	      <primary>m0n0wall</primary>
-	    </indexterm> - A stripped down version of &os; bundled
-	    with a web server and PHP. Designed as an embedded
-	    firewall appliance with a footprint of less than
-	    12&nbsp;MB.</para>
-	</listitem>
-
 	<listitem>
 	  <para><link xlink:href="http://zrouter.org/">ZRouter</link>
 	    <indexterm>