Too Long; Didn't Read
Netflix open-sourced Polynote, the internal notebook they developed, to the public. Polynote is more like a simple version of an IDE rather than nicer version of a REPL. It supports better auto-completion, linting, rich text editor, and LaTex support. Currently, Polynote only supports Python, Scala, and SQL. With more languages it supports, a skilled data scientist can use the best language for the right tasks. Data visualization is built-in and developers won’t need to write any code to visualize their data.