A full office suite, not unlike Microsoft Office, but based on Sun's StarOffice suite, which was released as an open-source licensed product (in the StarOffice version 5). Available for Windows, Linux, Solaris and BSDs, you may see it abreviated as "OOo".
Requires java, so the ports install takes a long time and you have to do all the downloading and unzipping etc that the Java page mentions. Alternately, you can get pre-built binaries for FreeBSD 5.4 or 6 -RELEASE at Good Day for both the older 1.2 or newer 2.0 OOo releases.
see also the project page here