This repository contains the source code of Logism, "a graphical tool for designing and simulating logic circuits." From its homepage:
Note: Further Logisim development is suspended indefinitely. [More information] (11 Oct 2014)
Logisim is an educational tool for designing and simulating digital logic circuits. With its simple toolbar interface and simulation of circuits as you build them, it is simple enough to facilitate learning the most basic concepts related to logic circuits. With the capacity to build larger circuits from smaller subcircuits, and to draw bundles of wires with a single mouse drag, Logisim can be used (and is used) to design and simulate entire CPUs for educational purposes.
Logisim is used by students at colleges and universities around the world in many types of classes, ranging from a brief unit on logic in general-education computer science surveys, to computer organization courses, to full-semester courses on computer architecture.
Why this repository? From Logism's Q&A page: "Can I get a copy of the source code?"
The source code is available under the GNU Public License, and it is included in the distributed JAR file within the
srcsubdirectory.
This repository contains the extracted files from the mentioned JAR file (version 2.7.1, the last released version from 2011), including the source code in the src subdirectory.