sane-frontends: Added NAPS2 to frontends list.

sane-frontends.html

@@ -147,12 +147,18 @@
         easy way.  It uses the
         <a href="https://github.com/jflesch/pyinsane">Pyinsane</a/>
         Python binding to interface with SANE (and Windows WIA API).
+      </li>
 
       <li>
         <a href="https://gitlab.gnome.org/GNOME/simple-scan">SimpleScan</a>
 	- a GNOME document scanning application.
       </li>
 
+      <li>
+        <a href="https://www.naps2.com">NAPS2 (Not Another PDF Scanner)</a>
+	- a free and open source scanning software for Windows, Mac and Linux.
+      </li>
+
     </ul>
 
     <h2>Graphical Frontends for Specific Devices</h2>