Bean is a small, easy-to-use word processor (or more precisely, a rich text editor), designed to make writing convenient, efficient and comfortable. Bean is Open Source, fully Cocoa, and is available free of charge! MS Word, OpenOffice, etc. try to be all
GPL'ed open source circuit design package, design PCB boards, many other circtuist. Connected with http://opencircuitdesign.com/ and http://petertodd.org/art/source-code/