Australia
Archives Office of Tasmania
Index to Will & Letters of Administration from 1824.
Public Record Office of Victoria
Guide to probate records at PROV.
Queensland Wills
Indexes to Wills from 1857-1940 from Supreme Court files.
Wills in Australia
Information and links for probate and wills in every state.
Overseas
Scottish Documents.com
Scottish wills 1500-1901, free searchable index, digital images can be purchased online.
The National Archives
PCC (Prerogative Court of Canterbury) wills, 1384-1858, free searchable index, digital images can be purchased online.
The National Archives
Research guide to probate records in U.K.