title: What modern C++ libraries should be in my toolbox?
body: <p>I've been out of the C++ game for about 10 years and I want to get back in and start on a commercial app.  What libraries are in use these days?</p>
  
  <ul>
  <li>User interface (e.g, <a href="http://www.wxwidgets.org/" rel="noreferrer">wxWidgets</a>, <a href="https://www.qt.io/" rel="noreferrer">Qt</a>)</li>
  <li>Database</li>
  <li>General purpose (e.g. <a href="http://www.boost.org/" rel="noreferrer">Boost</a>, <a href="http://loki-lib.sourceforge.net/" rel="noreferrer">Loki</a>, STL)</li>
  <li>Threading</li>
  <li>Testing</li>
  <li>Network/sockets</li>
  </ul>
  
  <p>I looking to be cross-platform compatible (as much as possible out-of-the-box).</p>
  
  <p>What libraries to do you rely on?  What features do they provide that make them <em>"indispensable"</em>?</p>
  
  <p>See <a href="https://stackoverflow.com/questions/777764/what-modern-c-libraries-should-be-in-my-toolbox/782146#782146">my answer</a> below for a summary.</p>