The National Archives Discovery website is the catalogue of their own collections but also includes records held by other archives
Find-an-archive, The National Archives register of UK and international archives:
Archives Hub includes the catalogues of 250 archives across the UK, many of which do not have their own websites
AIM25 collates descriptions of archive records held within the radius of the M25 motorway, many of which do not have their own websites
Europeana website collates digitized items from European museums, libraries, archives and multi-media collections
Archives Portal Europe gives access to information on archival material from different European countries
Archives and Records Association careers advice
Archives and Records Association volunteering advice
ARCHIVES-NRA list where jobs and placements are advertised
King’s College Cambridge guide to archives, using Rupert Brooke papers as a case study
University of Nottingham guide to archives, including useful information about medieval documents, old style weights, measures and money, and deeds
The National Archives video guides to using their collections
Leicestershire Museums Collections Resources Centre
Click, Connect, Curate, Create: online digital resources using Leicestershire Museums collections
Leicester City Council Museums Service
