Tides

Official sources
1. France, SHOM - http://www.shom.fr/fr_page/fr_serv_prediction/ann_marees.htm
2. United Kingdom, easytide UKHO - http://easytide.ukho.gov.uk/EASYTIDE/EasyTide/SelectPort.aspx
3. United Kingdom, NOC - http://www.pol.ac.uk/ntslf/tidalp.html
4. The Netherlands, RWS - Tidal data: http://www.rijkswaterstaat.nl/kaarten/astronomisch-getij.aspx
5. The Netherlands, RWS - Tidal data: http://getij.rws.nl/getij_locaties.cfm?taal=en
6. Germany, BSH - http://www.bsh.de/de/Meeresdaten/Vorhersagen/Gezeiten/index.jsp
7. United States, NOAA - http://tidesandcurrents.noaa.gov/gmap3/
8. Canada, CHS (pdf files) You will find the pdfs on the tide station page -http://www.waterlevels.gc.ca/eng/data/predictions/2013
9. Canada, CHS - http://www.marees.gc.ca/cgi-bin/tide-shc.cgi?queryType=showFrameset&zone=1&language=english&region=4&stnnum=3250

Other Harmonic TIDE Files
French and English Channel
See this forum thread http://www.ybw.com/forums/showthread.php?301791-OpenCPN-Tides-and-Currents
French Forum  Hisse https://www.hisse-et-oh.com/forums/heo-clubs/messages/1303942-telecharge...
Opencpn Shoreline (french website) may have some TIDE resources
http://opencpn.shoreline.fr/Tutoriel.htm
http://opencpn.shoreline.fr/8_Dossiers_techniques/DT_61_Les_fichiers_du_...
Visit My Harbor Tides http://opencpn.shoreline.fr/4_Plus_loin/P_51_VisitMyHarbour_Courants/P_5...
http://opencpn.shoreline.fr/8_Dossiers_techniques/DT_46_Les_dossiers_opt...

This source is probably the most direct at the moment.
HarmonicV9 & V10  http://pierre.lavergne1.free.fr/opencpn.php

Not for navigation!
XTide -  Harmonic tide clock and tide predictor. Work with X-windows, plain text terminals, or the web.
http://www.flaterco.com/xtide/

WXTide32 - a free Windows tide and current prediction program.
http://www.wxtide32.com/

WXTides Stations - tcdata, (HARMONIC, HARMONIC.IDX), for OpenCPN
http://fserv.skill-club.com/get_1088_156a.html

cTide: tide prediction software for PocketPC's
http://airtaxi.net/ctide/

JTides - an advanced, accurate, easy-to-use tide and current prediction Java MDI (Multi-Document Interface) application.
http://www.arachnoid.com/JTides/

QuickTide - a free Windows tide program specifically made for The Netherlands, especially for the tidal area of the Waddenzee. For Linux: runs under Wine. In Dutch only.
http://www.quicktide.nl/