From the project website (accessed 2016-07-06):
Here you will find a listing of digital research tools, covering a variety of purposes, prices and technical ability. Use the filters to narrow down the tools to suit your needs. This listing does not pretend to be comprehensive, so if you’d like to suggest a tool to be added please just fill in the form here.
The Digital tools for historians database can be searched or browsed by the following facets:
Hosted by the Instutite for Historical Research, University of London.