Adobe Photoshop

Price: approx. €672; also available as part of the Technical Communication Suite

http://www.adobe.com

Microsoft Expression Design

Price: approx. €729 (Expression Studio)

http://www.microsoft.com

PaintShopPro

Price: approx. €90

http://www.corel.com

Xara Xtreme

Price: approx. €299

http://www.xara.com

PhotoPlus

Price: approx. €85

http://www.serif.com

GIMP

Price: free (Open Source)

http://www.gimp.org

Paint.NET

Price: free (Open Source)

www.getpaint.net

RawTherapee

Price: free (Open Source)

http://rawtherapee.com

CinePaint

Available for Linux, Mac and BSD only.

Price: free (Open Source)

http://www.cinepaint.org

Phierha and Pixia

With a ficus on painting rather than photo editing.

Price: free (Freeware)

http://www.ne.jp/asahi/mighty/knight/

blender

3D rendering and animation.

Proce: free (Open Source)

http://www.blender.org

Aviary Advanced Suite

Advanced Image Editor, Effects Editor, Image Markup. Can export in Photoshop format and other formats.
Price: free (Web Application)

http://www.aviary.com/tools

Microsoft Visio

Price: approx. €329 (Standard) and €699 (Professional)

http://www.microsoft.com

SmartDraw

Price: approx. $197

http://www.smartdraw.com

ConceptDraw PRO

Price: approx. €199

http://www.conceptdraw.com

CorelDRAW

Price: approx. €630

http://www.corel.com

InkScape

Price: free (Open Source)

www.inkscape.org

OpenOffice Draw / OpenOffice Impress

Price: free (Open Source)

http://www.openoffice.org

KPresenter, Kivio, Karbon1, Krita

Price: free (Open Source)

http://www.koffice.org

Creative Docs .NET

Price: free (Open Source)

http://www.creativedocs.net

Dia

Price: free (Open Source)

http://live.gnome.org/Dia/

yEd Graph Editor

Feature-rich diagram editor.

Price: free (Freeware)

http://www.yworks.com/en/

Aviary Advanced Suite

Vector Editor. Can export in SVG, EPS, and other formats.
Price: free (Web Application)

http://www.aviary.com/tools

Corel DESIGNER

Price: approx. €949

http://www.corel.com

Canvas 11

Price: approx. $350

http://www.acdsee.com

Potrace

Command line tool that converts bitmap images to vector drawings. On the project home page there are also some links to free third-party GUIs for this tool.

Price: free (Open Source)

http://potrace.sourceforge.net

Vector Magic

Commercial tool to converts bitmap images to vector images.

Price: approx. $295

http://vectormagic.com

Sign Builder

Specialized graphics program for creating safety, industrial and general-purpose signs.

Price: approx. $299; there is also a free online version available

http://www.stclaire.com/go/sign_builder/

http://www.stclaire.com/go/industrial_signage/sb2/html

Web 2.0 Badges

Creates eye-catching badges, that can for example be used to say “new”, “beta”, etc.

Price: free (Web Application)

http://www.web20badges.com