Visual workflow builder for LLM apps — drag prompts into a canvas, deploy. The Retool of LLM apps.
From Wikipedia
Vellum is prepared animal skin or membrane, typically used as writing material. It is often distinguished from parchment, either by being made from calfskin, rather than the skin of other animals, or simply by being of a higher quality. Vellum is prepared for writing and printing on single pages, scrolls, and codices.