/abbr></code> compilers</a></li>
	  <li><a href="#TZif">Other <abbr>TZif</abbr> readers</a></li>
	  <li><a href="#software">Other <code><abbr>tz</abbr></code>-based time zone software</a></li>
	</ul>
      </li>
      <li>Related data
	<ul>
	  <li><a href="#other-dbs">Other time zone databases</a></li>
	  <li><a href="#maps">Maps</a></li>
	  <li><a href="#boundaries">Time zone boundaries</a></li>
	</ul>
      </li>
      <li>Timekeeping concepts
	<ul>
	  <li><a href="#civil">Civil time concepts and history<