What Text Editor Program Is Supposed to be Used for Forge?

What text editor are the card files for individual cards supposed to be opened and edited with? Notepad jumbles everything together in a big mess. For example:
What text editor are other people using instead of Notepad?
But I noticed that this board somehow reads and correctly adds the paragraph breaks. For example:Name:Vivien's JaguarManaCost:2 GTypes:Creature Cat SpiritA:AB$ ChangeZone | Cost$ 2 G | Origin$ Graveyard | Destination$ Hand | ActivationZone$ Graveyard | IsPresent$ Planeswalker.Vivien+YouCtrl | SpellDescription$ Return CARDNAME from your graveyard to your hand. Activate this ability only if you control a Vivien planeswalker.DeckHints:Type$VivienOracle:{2}{G}: Return Vivien’s Jaguar from your graveyard to your hand. Activate this ability only if you control a Vivien planeswalker.PT:3/2
- Code: Select all
Name:Vivien's Jaguar
ManaCost:2 G
Types:Creature Cat Spirit
A:AB$ ChangeZone | Cost$ 2 G | Origin$ Graveyard | Destination$ Hand | ActivationZone$ Graveyard | IsPresent$ Planeswalker.Vivien+YouCtrl | SpellDescription$ Return CARDNAME from your graveyard to your hand. Activate this ability only if you control a Vivien planeswalker.
DeckHints:Type$Vivien
Oracle:{2}{G}: Return Vivien’s Jaguar from your graveyard to your hand. Activate this ability only if you control a Vivien planeswalker.
PT:3/2
What text editor are other people using instead of Notepad?