Here are some links to genealogy- and history-related websites related to Lanark County, Ontario.
of others you find and I'll add them to this list. All links were working on April 10, 2017.
Almonte, Historic Photo Archive.
Several hundred photos related to Almonte places and people, from the 19th & early 20th centuries.
Lanark County Genealogy Society.
This website contains a large selection of documents, photos, family Bibles, family histories, etc.
Perth & District Historical Society. Another
large selection of documents and histories. Also see their extensive
Links Page
which has saved me weeks of time. I'll not duplicate their efforts and only post links here which aren't on their website.