Developed to support Croatian Run Restaurants in Los Angeles, but since I was doing it; I may as well lets others use and contribute. And it allowed me write my second Rails/Leaflet project.
Almost all of the initial street history information is from Los Angeles in the 1900s—Streets of a Hundred Years Ago. I’ve added the ability to put that information on a map. Morse's site is a treasure trove of historical and genealogical information.
The historic scanned maps came from sources linked to on the map. The scans were cleaned up using Photoshop Elements (mainly removing the collars). The georeferencing of the individual scanned maps was done using QGIS. Then those were combined and exported as a set of tiles using the QGIS plug-in QTiles.
Without the support of Stack Overflow users the site couldn't have happened. Searching there led to the solution of many problems, others were solved just writing up a problem, and others were solved by responses to my posts.
MaptimeLA introduced me to many of the technologies and inspired me to try to make the site. About the time I needed the information on this site, MaptimeLA held meetings at CSUN and UCLA reminding me of the great historical maps available, and CSUN's Chris Salvano mentioned his San Francisco Historical Street Names Index project which suggested a need for a similar repository for Los Angeles.
Also see the Acknowledgements page.
The code is on GitHub.