Mergent Onlinecan produce a list of members. Click theAdvanced searchtab. Then select theIndexsection of the criteria selector tool. Click+Indexand choose a TSX option from a list of major indices in the resulting drop-down. Once you have selected an index, clickSubmit, thenView.
Bloomberg (available in the Business Library): Select your index and type MEMB. Change the dates as needed. Data is available going back to 2001 for the TSX.
Capital IQ (available in the Business Library): For a current list, search for the index at the top of the screen. In the index profile see Constituents under the "Index Summary" heading in the menu to the left.