- R Markdown
Use a productive notebook interface to weave together narrative text and code to produce elegantly formatted output. Use multiple languages including R, Python, and SQL. 
- Pweave
Pweave is a scientific report generator and a literate programming tool for Python. It can capture the results and plots from data analysis and works well with numpy, scipy and matplotlib. 
- podoc
pandoc-compatible, Jupyter-aware document conversion library in Python 
- notedown
Markdown <=> IPython Notebook 
- knitpy
Elegant, flexible and fast dynamic report generation with python 
- stitch
Write reproducible reports in Markdown 
- JupyterLab
 Has a markdown+python mode
- nteract
Edit code cells, write markdown, visualize! - nteract_on_jupyter
nteract extension for your classic jupyter notebook server 
 
- nteract_on_jupyter
- ipymd
Edit Rmarkdown documents in Jupyter notebook 
@mrtns, what are the advantages and disadvantages of each of these options? Trying to chose one of these to use for my coding...