Download of netclasses 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Developer Tools, more precisely General. We recommend checking the downloaded files with any free antivirus.
From the developer:
netclasses is an asynchronous networking library that works on OS X natively, and any of the multitude of platforms supported by GNUstep.
Currently supports raw TCP/IP connections, the IRC protocol, and line-based protocols.
netclasses is an open source framework released under the LGPL. See http://www.gnu.org for licensing information.