WXTide32
«WXTide32 is a free 32-bit Windows (9x/NT/2k/ME/XP) program for predicting tides from 1970 to 2038. The included database has tide data for about 8,500 stations around the world and over 100 North American tidal current stations. Tides and currents can be displayed in graphical form or any of several text forms including daily tide lists and monthly tide calendars. The program is self-contained and has context sensitive help and extensive options to customize the content, display and presentation of data. A small installation program and all "C" source code are included»
See a screenshot.

JTides
«JTides is an accurate, easy-to-use tide and current prediction program. Predicts tides and currents using a large database of US and world-wide locations (over 2000). It graphs its predictions in many ways. Many locations can be graphed at the same time. You can print a calendar of tidal events. You may also print prediction charts or export application-portable databases of any size.»
This is a Java program able to run in virtually any OS. If you don't have it already you will need to download/install Sun's Java Runtime Environment (free). See a screenshot.