TeX4PPT and TeXpoint. It's much more professional but it is not for free except for a one-month trial.
If you prefer knit clothing over latex, there are five relevant blogs:
Weekend Diversion: Spock and the legacy of Star Trek (Synopsis) - “An ancestor of mine maintained that when you eliminate the impossible, whatever remains, however improbable, must be the truth.” -Mr. Spock, Star Trek Som...
15 hours ago