Edacious is an open-source Electronics Design Automation (EDA) toolkit. The distribution includes a graphical circuit editor, a mixed-signal circuit simulator and PCB layout / fabrication tools. Both GUI and command-line interfaces are provided.
You can download the most recent Edacious version from the Edacious Website.
The latest development version is available from the SVN Repository.
Edacious is freely distributable under the terms of a BSD license.
Thanks to Agar, Edacious is portable to many different platforms, including FreeBSD, IRIX, Linux, MacOS Classic, MacOS X, NetBSD, OpenBSD and Windows. For the list of official ports, see the Portability Page.