I wanted to know if the code for the NAND 2 Tetris tools was open source and if so, where is it available? Or do I need to contact one of the authors directly? I would like to make some changes to the screen capabilities in the CPU emulator?
This is basical just the source tarball from the Nand2Tetris homepage, with only some minor additionally commits, all done by David Lu (GitHub/Homepage). But since the source code is under the GPLv2 (or later), everyone is allowed to upload a fork to github. Just the use of the project name (nand2tetris) as username is a bit misleading.