Where can I find a list of constituents for an index?
Datastream via, Workspace will allow you to pull data, identifying information as well as company performance, for constituents or the index as a whole. In Bloomberg, use the code MEMB to view index constituents. Both have options to view historical index constituents.
For current members, Capital IQ shows the indices a firm is a member of. The Screening tool allows you to filter for many of the major global indices.