Data analysis with R handbook
Together with Mateusz Zawisza we have published a book (in polish)
Receptury w R. Podręcznik dla ekonomistów
about data analysis using GNU R.
It can be bought online at Oficyna Wydawnicza SGH.
On this website you can dowlnoad
WSE - Warsaw Simulation Engine
Warsaw Simulation Engine is a library written in Python 3.3.2 that allows to run discrete event simulations. It includes a set of example simulations using it.