PowerPoint Font Manager
The fonts a deck actually uses, and the ones you are missing

What it does
Drop in a .pptx and find out which fonts it actually uses, which of those are installed on the machine looking at it, and what to do about the rest. The hard part is that a plain search of the file is wrong: every Office theme carries a script-fallback table naming around thirty CJK and Indic fonts whether or not the deck contains a single such character, so three real presentations report 39, 36 and 9 typefaces where the true answers are 2, 4 and 6. Decks also name faces rather than families — "Helvetica Neue Medium", "Poppins Regular", "Times Roman" — which a naive check calls missing when the font is sitting right there. It resolves both before it says anything. Missing fonts that Google Fonts publishes can be fetched, and anything left over goes into a sidecar .zip with per-platform installers. A desktop build installs them outright.