I am building a PostGIS/TIGER/PAGC/other data engine to improve address data. It comes in dirty, I want to improve it as much as possible: Normalize, geocode, v

I am building a PostGIS/TIGER/PAGC/other data engine to improve address data. It comes in dirty, I want to improve it as much as possible: Normalize, geocode, verify, correct. Correction is basically a pipe dream for bulk operation but it's needed for point-fixes. Everything else is feasible in bulk. I haven't found all the features under one hood yet. It has to be downloadable because I am not allowed to send my data out to third parties. It has to be free because I have a LOT of data. The North American markets for shipping packages are well served by multiple products in this space; efforts to contextualize/augment poor quality North American address data are not well served. Hope that helps!