JuiceboxBuilder (both Lite and Pro versions) has the ability to extract IPTC data for use as image titles and captions via the 'Images -> Titles -> Use IPTC Title' and 'Images -> Captions -> Use IPTC Caption' options from the drop-down menu at the top.

If you are entering IPTC data in an Adobe program (such as Lightroom or Photoshop), then the label you'll need to use for the image title is IPTC Document Title and the label you'll need to use for the image caption is IPTC Description.