Media Manager running in background for Kodi Library

Hi! I’m trying to ease the pain of Kodi to get movies info (using Universal Movie Scrapper + TVDB) and artworks (using Artwork Downloader) by getting a Media Manager running in background on my computer… In my way of thinking, I would like this Media Manager to write .nfo files and artworks within each library directories and then configure Kodi to only use local .nfo files and artworks (in Artwork Downloader: Use local images) rather than scrapping new movies.

Is there such a media manager available?
I know this is totally possible doing it manually: Launch the media manager, refresh… But I would like it to run in background, once set up, no need to pop up the GUI again except to do modifications!

Thanks