Datawiki offers a centralised data catalogue. It has detailed examples of handling domestic open data with modern computational languages and active community driven support. The focus is on the most central domestic open data sources. The R-programming language and Python environments offer flexible and powerful tools for manhandling open data interactively. Even the source code and analyses are transparent, repeatable and re-usable. The Wiki-site is being developed continuously and users can participate in drafting the guide.