Old Fort Collins, 1865 is an online digital archive and is only a small but significant selection of historical materials, records, and photographs located in the Fort Collins Local History Archive. I found the News Flashbacks, Local Anecdotes and WWII Oral History sections to be fascinating reading and full of information about the people who settled in the Fort Collins area.
This site also has two of the larger Fort Collins cemeteries, Grandview and Roselawn, on-line. The search takes a little getting used to as you are taken to a sub site called FCMaps. Along the ribbon bar at the top you select a menu option to search for surname. That seems to be the easiest way to search this data.