Neptune.jl is effectively a lightweight variation on the Jupyter notebook theme, but written entirely in Julia, based on the package Pluto.jl, but not tied to the ‘reactive execution’ mission being pursued by the developers of Pluto.
[In simple terms, Neptune may be seen as Pluto for Data Scientists]
In terms of ‘feel’ Neptune behaves largely like a simplified version of Jupyter, and has been demonstrated to be ideal for teaching introductory Data Science classes. In conjunction with the Julia REPL, Neptune constitutes a very simple attempt at a lightweight native IDE for Julia.
Additionally, notebooks saved by Neptune may be executed as standard Julia scripts.
One limitation (currently under review) of Neptune as compared to Jupyter, is that cells are by default assumed to consist of a single line… muli-line cells must begin with ‘begin’ and finish with ‘end’.
[update: this has been fixed as of latest release 0.14.0]