The Grease Portability Library

Zodiac is an open-source Smalltalk framework implementing TLS/SSL secure as well as regular socket streams.

Zinc HTTP Components is an open-source Smalltalk framework to deal with the HTTP networking protocol.

STON - Smalltalk Object Notation - A lightweight text-based, human-readable data interchange format for class-based object-oriented languages like Smalltalk.

XML Parser for Pharo - GemStone port