
Scribus: A professional page layout program for Mac OS X, Windows, Linux, with a combination of press-ready output and new approaches to page design. You work on your canvas with minimum distractions, bringing up the interface only when you need it. It lets you focus on the art instead of the program. MyPaint is a free tool for digital painters So what software is actually included? Full lists can be seen at the project's page and at the Wikipedia page, but here are a few highlights: Graphics/publishing You have never had it this easy on Mac or Windows! Or as affordable. Reboot after the install, and you are presented with a kicking content creation workstation, ready to get to work. Its single 2.7Gb download includes a long list of tools, all of which get installed at the same time you install Ubuntu itself. So instead of having to download and install Ubuntu, and then each and every productivity software package one at a time, Studio does it all for you. An off-shoot project from the regular Ubuntu team, Studio's main goal is to create a distribution designed for artists that already includes all the tools you might need in your daily work of making content. The project developers at Ubuntu Studio get that too. You want your computer life as simple as possible and get down to creating.
So integration with your other applications, and with other team members using commercial software is very doable. Inkscape supports SVG, EPS and PDF, and Blender has a wide range of 3d standard exports. So GIMP will read and write Photoshop format (in addition to JPG, TIF, etc.).
But keep in mind that most offer the ability to read and write their files to industry standards file formats.
If you must have certain features only available in commercial applications, then certain open source packages may not be for you. Blender is used by a large and enthused community of 3D artists worldwide