Developed to support Croatian Run Restaurants in Los Angeles, but since it was being done; may as well lets others use and contribute.
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 Stackoverload 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.
For status of the development of the site see the GitHub repository.