What is Jupyter?
The Jupyter Notebook is a web application that allows you to create and share documents that contain live code, equations, visualizations and explanatory text. Uses include: data cleaning and transformation, numerical simulation, statistical modeling, machine learning and much more.
Comments and Reviews
Said about Jupyter as an alternative
It can run python inline and do markup work all in one system. Can be worked via network and connected to via browser (including through phone) and set up to run distributed computing systems easily. Additionally it's open source and server side runs on most major operating systems.
Not exactly an alternative - but, combined with a programming language like Python, Julia, Maxima, Mathematica or MATLAB, it provides a superior coding and teaching experience. It, in fact, can support Octave
It runs python and markdown