Cxxtools contains an argument-parser, a base-64 encoder/decoder, a c++ interface to iconv, md5-stream for easy md5 calculation, threading classes, socket classes, a dynamic exception-safe buffer, a wrapper for dlopen/dlsym, a pool template (e.g., for a connection pool in a multi-threaded application), query_params, and a class for easy parsing of cgi parameters (get and post) in a cgi program.