1 . Gimp: GIMP has a rich set of filters and tools to manipulate photos for print or Web publishing.It has a comprehensive user manual and a fair amount of help online. GIMP is available for Windows, Linux, and Mac OS X, and it now runs natively on OS X, without the need to install special X11 libraries.
2.Inkscape: Inkscape lets you edit and create complex (or simple) artwork -- anything from icons and simple clip art to complex illustrations for children’s books.
3.Scribus: Scribus is similar to tools like Adobe InDesign or QuarkXPress. The Scribus Project provides packages and installers for Linux, Mac OS X, and Windows.
4. LibreOffice Draw: LibreOffice is the most actively developed free and open source office suite, a project of The Document Foundation. The LibreOffice suite comprises programs for word processing, the creation, and editing of spreadsheets, slideshows, diagrams and drawings, working with databases, and composing mathematical formulae.
5.Blender: Last, but very certainly not least, is Blender. Blender is capable of stunning 3D work—and not just still images. Blender has been used to create animated masterpieces like Big Buck Bunny and Elephants Dream. Blender is available for Windows, Linux, Mac OS X and more.