FREE PIMS offers almost two hundred free Personal Information Managers and the lists keeps growing. Also freeware in every Internet category possible plus a ton of webmaster tools and freebies.
OpenOffice works well with the Mac, the PC, Linux, and so on. It works so well with Microsoft Office that you can easily share documents with folks that don't use OpenOffice; no hassles at all. Fully-featured, versatile, powerful Office Suite.