Hello, World Program: Classic test program, written in ICON.
Icon: Imperative, procedural, high-level, general purpose, many features for processing data structures, character strings, C/Pascal-like syntax, but far higher semantics. Has documents, books, implementations, libraries, Java-based Jcon.
Icon Tutorials: Information on many aspects of Icon programming
Jcon: A Java-Based Icon Implementation
Reducing Field Table Size in the Icon Translator: Technical report by Richard Hatch and Clinton L. Jeffery.
Ulex: A lexical analyzer generator for Unicon.
Unicon: A portable, high level network and graphics savy "modern dialect" descending from the Icon programming language with support for OpenGL, OOP features, POSIX support, and ODBC.