This is a simple digital logic simulator, which I created as part of my video series: Exploring How Computers Work.
You can find the latest windows/mac/linux builds over here.
If you want to make modifications to the program, you should open the source files in the Unity engine.
Please note that I won't be accepting pull requests at the moment, but you're welcome to create your own fork of the project, or contribute to some of the awesome community versions. If you plan on distributing your version, please make sure that it's following these guidelines.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.