General reference

For everything:
http://en.wikipedia.org/wiki/Main_Page

For scanned books:
http://books.google.com/(Google should be applauded for this project- it is incredibly useful)
http://www.archive.org/index.php (which does a better embeddable book reader than Google Books, and seems to have more books too)

To provide hyperlink references to specific phrases:
http://en.wikiquote.org/wiki/Main_Page (for famous quotes)
http://en.wikisource.org/wiki/Main_Page (for passages from famous works), e.g.
http://en.wikisource.org/wiki/Bible_(King_James) (which I link to for biblical references)

For gravestone and monument images:
Charles Sale's very useful site http://www.gravestonephotos.com/






Maps & Streetview


http://maps.google.co.uk/ (which does good embeddable 'custom' maps)
http://www.bing.com/maps/ (which does OS maps and Bird's Eye angular aerial photography in places)

For historical maps:
http://www.visionofbritain.org.uk/index.jsp (not embeddable, sadly)

For embeddable Streetview imagery:
http://www.streetcities.com/

For 'surname maps':
http://gbnames.publicprofiler.org/ (Maps and statistics of British surname distributions; not embeddable, sadly)
http://worldnames.publicprofiler.org/ (Maps and statistics of world surname distributions; not embeddable, sadly)







Genealogy sites


Useful books online:
Debretts Baronetage of England, seventh edition (1835) at http://books.google.co.uk/books?id=DUcRAQAAIAAJ
Burke's A General and heraldic dictionary of the peerage and baronetage of the British Empire, Fourth edition Volume 2 (1832) http://books.google.co.uk/books?id=seAKAAAAYAAJ

Completely free:
http://www.thepeerage.com/index.htm (for better off families)
http://www.freebmd.org.uk/ (BMDs)
http://www.freecen.org.uk/ (censuses)
http://www.freereg.org.uk/ (parish registers)
https://www.familysearch.org/ (searches the Mormons' "International Genealogical Index")

Premium subscription:
http://www.genesreunited.co.uk/ (free registry to post your tree and search others, but subscription-based to contact others through the site for more info)
http://www.findmypast.co.uk/home.jsp (free 14 day trial; access to 1841-1911 censuses, BMDs index 1837-2006, parish records for baptisms, marriages and burials from 1538, and migration records, military records and others)
http://www.ancestry.co.uk and http://www.ancestry.co.uk ()






Genealogy software


Completely free:
Personal Ancestral File (http://www.familysearch.org/eng/default.asp?page=home/welcome/simplePAFRegistration.asp; from the Mormons' familysearch.org site; seems now to be unsupported in favour of online alternatives)

Purchasable:
http://www.genopro.com/ (my personal choice as it does great clear visual pedigrees, but there haven't been updates for years and it is hard to embed the pedigrees in sites).
http://www.familytreemaker.com/ (linked to http://www.ancestry.co.uk and http://www.ancestry.co.uk)
http://www.legacyfamilytree.com/
http://www.rootsmagic.com/
http://www.ancquest.com/index.htm
http://www.family-historian.co.uk/
http://www.whollygenes.com/tmg.htm