WebStor efficiently enumerates all websites across your organization’s networks and those in your DNS records - including cloud-hosted servers via zone transfer data - stores their responses, and lets you query for known web technologies, including those with zero-day vulnerabilities.
Just to let you know: it seems that a few days ago Wappalyzer changed their technologies.json file to a different structure (i.e. to several separate json files in a folder). This basically breaks the ability to download their technology signatures.
It shouldn't be too hard to iterate through the folder and combine them into one json file (or load the content of each into the database while iterating). I'll give it a try and post any updates here if you don't beat me to it.
I think the github API might be a good way to start: https://api.github.com/repos/AliasIO/wappalyzer/contents/src/technologies?ref=master