matplotlib

Matplotlib is a library with a very 'Matlab' like environment for generating publication quality figures. You can output to raster formats (e.g., PNG, TIFF, JPG) immediately in a pop-up window or to vector (e.g, EPS, PS) formats that are saved as files. The style of graphs and syntax for creating them, especially when combined with the added Python language constructs through NumPy will be very familiar to users of Matlab.
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wxPython

wxPython is a Python library for creating GUI applications.  This post describes how to install wxPython with Vizard. It also includes a sample script showing how to embed the Vizard graphics window inside a wxPython application.
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