t al.</li>
</ul>

<h3><a name="Preprocessor">Preprocessor</a> Metaprogramming</h3>

<ul>
    <li><a href="preprocessor/doc/index.html">preprocessor</a> - Preprocessor 
    metaprogramming tools including repetition and recursion, from Vesa Karvonen 
    and Paul Mensonides.</li>
</ul>

<h3><a name="Concurrent">Concurrent</a> Programming</h3>

<ul>
    <li><a href="thread/doc/index.html">thread</a> - Portable C++
      multi-threading, from William Kempf.</li>
</ul>

<h3><a name="Math">Math</a> and numerics<