Hylafax is a great, reliable fax server. It works with almost any fax modem. The main web page is at www.hylafax.org
Although a new version (v 6.) has just been released, I am working with one of the older versions (v4.4.4).
I've installed another Open Source program that does OCR. It's called tesseract-ocr code.google.com/p/tesseract-ocr/