I never tire of seeing Datasette on HN. It saved me last week when business folks sent me four huge excel sheets of data that I'd need to answer questions about during a meeting. I exported to CSV, then into SQLite, and immediately had a shareable web page I could query and filter in realtime. Vastly more useful to me (as an engineer) than Excel, and having the full power of SQL is a delight.
Wish list: I wish it were a single executable I could carry around, like fossil, jq, rclone, rg/ag, sqlite3, gitea, micro, etc.
Worth mentioning that https://github.com/dfinke/ImportExcel does excel -> powershell -> excel in a really nice package for that kind of filtering/etc work.