IPUMS provides census and survey data from around the world integrated across time and space. Specific projects include IPUMS-USA, IPUMS-International, IPUMS-CPS (Current Population Survey), and IPUMS-NHGIS (National historical GIS). All are available from the link below.
The Inter-university Consortium for Political and Social Research (ICPSR) provides access to an archive of over 500,000 data files for researchers in the social sciences. Registration is required using your utoronto.ca email address.
The SDA interface allows for the subsetting and analysis of hundreds of public use microdata files, permitting microdata exploration and visualization in your browser.
Odesi is a repository of over 3,500 Canadian social science datasets, including Statistics Canada microdata files and statistical tables, as well as a range of public opinion polling data.