LibreOffice Draw

LibreOffice started when OpenOffice, a leading free (I love free) alternative to Microsoft Office, was forked in 2010 in response to concerns over Oracle buying Sun Microsystems.  LibreOffice has word processing (Writer), spreadsheets (Calc), presentations (Impress) and drawings (Draw), and several others.  Most useful to me is Draw, which can open Microsoft Visio files.  Visio is pretty pricey software and I don't need to save drawings as .vsd files, just open and print them, which Draw does very nicely.

http://www.libreoffice.org/