Playscii is an open source ASCII art program, the successor to EDSCII. It runs on Windows and Linux, and will run on Mac OSX soon after a bit more work.
More info: http://vectorpoem.com/playscii/
Please note that Playscii is open source, still in early development, and is offered as a pay-what-you-want download here on itch. Testing and bug reports are appreciated!