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:
Ask Ethan: How Do We Know The Earth Isn’t Flat? (Synopsis) - “A long time ago people believed that the world is flat and the moon is made of green cheese. Some still do, to this day. The man on the moon is looking do...
1 day ago