PicasaWeb class is a PHP class that can be used to display galleries of photos from PicasaWeb albums. It can access the PicasaWeb Web services API server and retrieve information about albums or photos in order to generate HTML to display photos in the current site. The class can display listings of albums in a given PicasaWeb account and display the photos of a given album.
Google Custom Search is a class that performs searches against a Google Custom Search engine, processing the response (search results and/or spelling suggestions) into properties of the object. It uses either cURL or the HTTP stream wrapper, depending on what is available on the server. The user can also specify the character encoding for the search query. Results are also made available in that encoding.