I started DMing  for the first time a few weeks back but struggled with keeping track of buffs and stuff through rounds, so I made this.
You can track players and creatures HP,  actions, buffs, and conditions, and they will count down when you go to the next round.
There is also a quick note taking sections too.

The project is here, source code available in the description:  https://bolthead.itch.io/dnd-combat-tracker