Piet

Piet on the Net and in the Media

Mind Candy's Perplex City alternate reality puzzle game featured a Piet puzzle card as part of its £100,000 2005-2006 competition!
Thomas Schoch has some beautiful Piet programs.
Piet was featured in Round Two of the 2002 MIT Mystery Hunt.
Pedro Gimeno Fortea has written an article about esoteric languages (in Spanish), including a discussion of Piet.
Guy L. Steele ("The Great Quux") of Sun Microsystems and Richard P. Gabriel of IBM Research present Piet as part of their "50 in 50" talk about the history of computer languages, which they have presented at several major computer science conferences! You can see the entire presentation here; Piet is introduced around the 20:25 mark.
This geocache in Quebec contains some Piet content.
The coder a-k- has implemented Piet inside his two-dimensional programming-based puzzle game 5N²+6N-4 (inspired by Manufactoria, Jahooma's LogicBox, Robot Unlock, and SpaceChem).
The contemporary art magazine Outland published an article on algorithmic glitches which mentions Piet as an example of blending visual data and code. (November 2023)

Someone actually made a compiler! Oh my!

Kelly Boothby has written repiet, a compiler that compiles Piet programs into Python, C++,... and Piet! It's available here on Github.
Sergei Lewis has written a Piet assembler - it takes instructions and converts them into a graphic program! Available from here.

Piet discussion forums. Note: These are hosted by an interested third party, not me.
Marc Majcher has written a Piet interpreter in Perl, documented here. This version has a buggy interpretation of crossing white blocks.
Sylvain Tinitillier offers a bug-free Perl version (zip file here).
Erik Schoenfelder has written npiet, a very nice Piet interpreter with the ability to print program traces and a supporting Piet editor! It's feature-packed and pretty cool.
Ross Tucker has written a Python version of Marc Majcher's interpreter, Piet.py (text file). Ross notes that he thinks Marc switched the ASCII and literal values for the different input and output commands, so he has swapped them. Ross has also corrected the white block bug.
Another interpreter, written in C for Linux, by Frank Zago.
Tomasz Ducin has written a nice graphical Piet interpreter in C++, available on Github.
Thomas Enebo has implemented an interpreter in Ruby, available on Github.
G33kdude has written an interpreter in AuotHotkey, available on Github.
Philipp Tessenow has written a Piet interpreter in Rust, available on Github.
Jens Bouman has written a Piet interpreter using functional Python, available on Github.
ynn has written a Piet interpreter in Rust, available on Github.

Mark Schad has written HIPI, a graphical IDE and interpreter for Piet.
Oscar Rodriguez has written PietDev, a graphical IDE and debugger for Piet, which runs in your browser using JavaScript!
Steven Anderson has written a Piet IDE/Interpreter/Debugger called Piedit, available here, or here.
Casey Link has written Piet Creator, a "robust cross-platform GUI IDE development and debugging tool for Piet, that embeds Erik's fantastic C interpreter npiet". It is available here with C++ source code, and should compile and run on Linux, Mac, and Windows.
There's a web Piet IDE hosted by zobier.net.
An in-browser IDE/interpreter written in JavaScript with the React framework by Gabrielle Singh Cadieux.
Jared Landers has written Text2Canvas, a converter to turn a text representation into an image, to allow editing Piet programs in a text editor.

Didier Deses has written an introductory tutorial on Piet programming.
copb-phoenix has licensed a palette for use with GIMP and Inkscape, to assist in creating Piet programs in those tools.