Unless you're a newcomer to family history you likely know of the free access to Ancestry's suite of name indexed Canadian census records, from 1851 to 1916, at many public libraries and Family History Centres.
They were completed under a collaborative arrangement with Library and Archives Canada. The agreement is summarized at http://www.collectionscanada.gc.ca/about-us/012-215.01-e.html and includes a table of projects currently underway to be posted online, on the LAC website, as time and resources permit.
* Family Search provided the index available on the LAC website. LAC provided the digital images of the 1881 Census to Ancestry.ca.