It looks like you're referring to a type of editor to write Michelson code, which is a programming language used in the Tezos blockchain. VisualTez is a popular editor used for this purpose, as it allows users to write, compile, and deploy Michelson code with a graphical user interface. VisualTez has a lot of helpful features, such as syntax highlighting, auto-completion, and debugging tools, which make it a great choice for writing and deploying Michelson code.