Adobe Acrobat supports executable Javascript in PDF files.
Somebody compiled DOOM to webasm, embedded it in Javascript in a PDF, and if you open it in a Chromium-based browser you can play it.
A Minecraft server written in COBOL. It supports Minecraft v1.21.4 (the latest version at time of writing). Supports what looks like all of the basic functionality. Developed using GnuCOBOL and is meant to be run on Linux. Support for other operating systems such as Windows has not been tested. However, it is possible to use Docker for a platform-independent deployment.
Note that blocks with multiple states, orientations, or interactive blocks require large amounts of specialized code to make them behave properly, which is way beyond the scope of this project. Some are supported, however: Torches (all variants), slabs (all variants), stairs (non-connecting), rotated pillars (such as logs or basalt), buttons (non-interactive), doors (including interaction), trapdoors (including interaction), and beds.
The official Minecraft (Java Edition) server and client applications contain large amounts of data. Fortunately, the freely available server .jar offers a command-line interface for extracting this data as JSON. The CobolCraft Makefile has a target that downloads the .jar and extracts the JSON data from it. The JSON files are evaluated at runtime using a custom-built generic JSON parser, such that CobolCraft can inter-operate successfully with the Minecraft client without distributing potentially copyrighted material.
A complete implementation of Tetris in a SQL query. Written for Postgres. Has a Python front-end that uses psycopg2.
How to hack a microSD-to-SD card adapter to work with a 3.3 volt microcontroller.
A .zip file which, when uncompressed, is a perfect copy of itself.
Conway's Game of Life, implemented as a shell script.
A news aggregator of new and ongoing data breach cases.
Tavis Ormandy ported Lotus 1-2-3 to Linux.
Homepage of the PLA. Fun stuff, here!
A hacked X server that displays everything as ASCII art.
Someone fed ROM dumps from a couple of Atari games into distellamap and generated maps of function calls, with sprite dumps. Amazing, how simple games were back then...
An excellent blog post on how Wordpress backdoors work, how they're hidden, and how they're used.
A simple webapp that calculates the resistor and capacitor values to make a 555 generate a signal of a particular frequency.
Site that has a wide array of hats addons modules for the raspi.
RepRap is an open-source (hardware, software, and documentation) desktop fabrication system which lets you construct arbitrary objects (or parts for assembling more complex systems). It's unique in that you can construct one yourself for about $400us, and it is fully capable of making duplicates of itself.
A website of alternative energy and DIY home projects. Ever wanted to build your own windmill, generator, or CNC router? Check this site out.