In literature and film:
* Falling action: This is the part of the story where the conflict begins to resolve, and the tension decreases.
* Resolution/denouement: This is the final part of the story where the loose ends are tied up and the story concludes.
In music:
* Coda: A musical passage that comes after the main part of the piece, often providing a sense of closure.
* Outro: A short ending section in a song, sometimes just a repeating instrumental phrase.
In other contexts:
* The aftermath: The consequences of the climax, which can be positive or negative depending on the situation.
* A new beginning: Sometimes, the climax can be a turning point that leads to a new phase in life or a new set of challenges.
To give you a more specific answer, please tell me what you are referring to when you say "climax".