XSLT is an XML language for defining transformations of XML files from XML to some other arbitrary format, such as XML, HTML, plain text, etc. using standard XSLT version 1.0 stylesheets.

The guiqwt Python library provides efficient 2D data-plotting features (curve/image visualization and related tools) for signal/image processing application development and interactive computing. It's based on the scientific modules NumPy and SciPy, and the PyQwt plotting widgets for PyQt4 graphical user interfaces.

The Python Imaging Library (PIL) adds an image object to your Python interpreter. You can load images from a variety of file formats, and apply a rich set of image operations to them.

Alliance is a complete set of free CAD tools and portable libraries for VLSI design. It includes a VHDL compiler and simulator, logic synthesis tools, and automatic place and route tools.

Elementary Icons is an original set of vector icons designed specifically for elementary OS and its desktop environment: Pantheon.