shp2D3
Convert a 2D ESRI shapefile to 3D using a Digital Elevation Model (gadl formats)
This plugin requires pyshp library previously installed.
On windows: 1) install python (if you do not have already installed) - (http://www.python.org/downloads)
2) install pip using the get-pip.py script (http://docs.python-guide.org/en/latest/starting/install/win/)
3) open command prompt
C:/PythonXX/python -m pip install pyshp
On linux use the package python-pyshp
e.g on debian/ubuntu distribution sudo apt-get install python-pyshp