libConfuse is a configuration file parser library written in C. It's goal is to be easy to use and quick to integrate into existing code. It supports sections and (lists of) values (strings, integers, floats, booleans, or other sections), as well as some other features (such as single/double-quoted strings, environment variable expansion, functions, and nested include statements). It makes it very easy to add configuration file capability to a program using a simple API.
taged is a commandline utility that can create and modify ID3 data, usually found in .mp3 files. Besides supporting text frames like artist, title, track number, etc., it also supports attached pictures, play counters, and generated playlists. It aims at being quick and easy to use when many tags needs to be created/updated, and handles regular expression matching of tag data from filenames, as well as renaming files based on the tags.
Yafc is yet another FTP client which features a directory cache, remote filename completion, aliases, colorized ls, recursive get/put/ls/rm, nohup mode transfers, tagging (queueing), multiple connections, proxy support, and more. It has also support for Kerberos authentication and SSH2 (sftp).