Man, I love these kinds of threads! I rip all my CDs and share the audio files across my computers. The audio files are backed up, and my CDs are on full display. I know it's not the "Show yer collection" thread from the early 2000s, but here it is, minus the Mosaics and similarly sized box sets: https://www.flickr.com/photos/187626192@N04/49702197523/in/dateposted-public/.
I keep a master spreadsheet in Google Drive, with basic information - artist, title, label, label #, any additional notes that I find interesting (e.g. RVG series) and number of discs. I use Lord's Discography to record the CDs and individual tracks that I own. Selecting the tracks one by one made for a tedious summer, but it's easier to to add new purchases now that the bulk of the collection is already in there. Although Lord is not perfect, it's pretty good and an easy way for me to, say, look up a box set and see how much music I'd be duplicating. I can look up the Mosaic Boogie Woogie select and easily see that I have the majority of the music on Chronological or Collector's Classics discs and the Lionel Hampton Mosaic set.