Wales

1911 UK Census including Wales $ Searches free, pay for downloads
1939 Register of England and Wales $ documents covering the entire civilian population of England and Wales at the start of WWII
Cymru1900Wales Volunteer crowdsouring effort to identify all of the place names and features in Wales from the Ornance Survey’s 1900 maps of c.1900
HistoricalDirectories University of Leicester’s collection of online historical city directories from 1717 to 1919
Kelly’s Directory of Monmouthshire & South Wales 1920 Directory
People’s Collection Wales (Casgliad y Werin Cymru) online archive with share family trees, special interest groups and historic maps of Wales
Rootschat messaging forum for anyone researching their family or local history with a focus on the British Isles
UK Probate Service search the probte index and read summaries for free and order a digital copy of a will for for download for a fee
The Wales-Ohio Project a digitized selection of Welsh Americana relating to the state of Ohio held at The National Library of Wales
Welsh Newspapers Online digitized, searchable historic newspaper collection from the National Library of Wales