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Egressive Limited
Egressive is an open source software company, specialising in web applications built on the Drupal framework and Ubuntu Linux server infrastructure and support. We provide strategic IT consulting services and assist businesses and organisations in migrating to open source infrastructure, both on the server and the desktop. We maintain a significant open source hosting infrastructure and provide managed services both in New Zealand and overseas data centres.

Website:
http://egressive.com

Gerris Flow Solver
Website:
http://gfs.sourceforge.net
Gerris Flow Solver is a very different software project but one in use around the world by scientists and engineers working in the field of fluid dynamics. It stands out in this field as an open source offering amongst a number of strong commercial packages, providing anyone with the curiosity and enthusiasm to explore fluid behaviours with a rich toolset. Its modular design means Gerris will continue to expand with a growing community of developers continuing to improve the core product.

If you have a requirement for graphic design tools then some of the following may fit your needs.

Drawing and Graphics: Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator, Freehand, CorelDraw, or Xara X using the W3C standard Scalable Vector Graphics (SVG) file format. Supported SVG features include shapes, paths, text, markers, clones, alpha blending, transforms, gradients, patterns, and grouping. Inkscape also supports Creative Commons meta-data, node editing, layers, complex path operations, bitmap tracing, text-on-path, flowed text, direct XML editing, and more. It imports formats such as JPEG, PNG, TIFF, and others and exports PNG as well as multiple vector-based formats.
Image processing: The GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
Font creation and editing: FontForge is outline font editor that lets you create your own postscript, truetype, opentype, cid-keyed, multi-master, cff, svg and bitmap (bdf, FON, NFNT) fonts, or edit existing ones. Also lets you convert one format to another. FontForge has support for many macintosh font formats.
Desktop Publishing: Scribus brings award-winning professional page layout to Linux and *nix desktops with a combination of "press-ready" output and new approaches to page layout.