Inkscape (Portable)

Open Source vector graphics editor

Inkscape is an Open Source vector graphics editor, with capabilities similar to Adobe Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. We also aim to maintain a thriving user and developer community by using open, community-oriented development.

http://inkscape.org/download/?lang=en

GIMP (Portable)

Image editor

The GIMP (GNU Image Manipulation Program) is a freely distributed program for such tasks as photo retouching, image composition and image authoring. It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

http://portableapps.com/apps/graphics_pictures/gimp_portable

Skype (Portable)

Instant messaging, video chat and phone calls

Skype lets you connect to others via instant message, audio conferencing and video phone. It can also call regular phone lines from anywhere in the world. It's packaged as a portable app so you can communicate on the go.

Online Installer: This is an online installer that will download additional files during setup.

http://portableapps.com/apps/internet/skype_portable