Id3 Tag Correction and Downloading is a PHP class that can be used to correct tags of MP3 tags of music with records stored in a MySQL database. It scans a MySQL database table with information about music albums to see which albums do not yet have the associated ID3 tags. The class accesses the Web services APIs of sites like audioscrobbler.com, last.fm, lyricwiki.org, and lyricsfly.com to correct the pending music tags and get other details about the stored music.
Usenet Downloader can be used to retrieve newsgroup articles from NNTP servers. There is a generic NNTP class that can retrieve listings of groups, listing of group articles, and the article headers and bodies. There are other classes that can retrieve listing of groups from several different sites and insert the listings into a MySQL database table. Other classes can retrieve groups stored in the database and retrieve articles of those groups from the NNTP servers.
Loomes' Nested Set is a class that can be used to manage a tree of information stored in a database. It can perform several types of operations to manipulate a hierarchy of nodes that are stored in a database as table records. Currently, it can insert a root node, insert a node that is child of a given parent, delete a branch of nodes under a given node, delete a single node, rename a node, move nodes, check whether the root node exists, and retrieve the whole tree of nodes.