Buros Institute of Mental Measurements makes a lot of its material available on its website free-of-charge or for a small fee.
ETS Test Collection is a not for profit Educational Testing Service.
Pearson Assessment provide many products adapted to UK needs. The focus is on Psychology, Allied Health and Education. Each test is classified with a Qualification Code.
The database has a field called "Tests and Measures", selecting this option lets you search for tests and measurements used in a document.
From the search page, select the multi-field search option.
Click on the "Select field" menu and scroll down to TM "Tests and measures".