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This module is a true drop-in replacement for IO::Socket::INET that uses SSL to encrypt data before it is transferred to a remote server or client. IO::Socket::SSL supports all the extra features that one needs to write a full-featured SSL client or server application: multiple SSL contexts, cipher selection, certificate verification, and SSL version selection. As an extra bonus, it works perfectly with mod_perl.
IO::Socket provides a way to set a timeout on the socket, but the timeout will be used only for connection, not for reading / writing operations.
The "IO::String" module provides the "IO::File" interface for in-core strings. An "IO::String" object can be attached to a string, and makes it possible to use the normal file operations for reading or writing data, as well as for seeking to various locations of the string. This is useful when you want to use a library module that only provides an interface to file handles on data that you have in a string variable. Note that perl-5.8 and better has built-in support for "in memory" files, which are set up by passing a reference instead of a filename to the open() call. The reason for using this module is that it makes the code backwards compatible with older versions of Perl.
This toolkit primarily provides modules for performing both traditional and object-oriented I/O) on things *other* than normal filehandles; in particular, IO::Scalar, IO::ScalarArray, and IO::Lines. In the more-traditional IO::Handle front, we have IO::AtomicFile, which may be used to painlessly create files that are updated atomically. And in the "this-may-prove-useful" corner, we have IO::Wrap, whose exported wraphandle() function will clothe anything that's not a blessed object in an IO::Handle-like wrapper... so you can just use OO syntax and stop worrying about whether your function's caller handed you a string, a globref, or a FileHandle.