Inkscape!

Design quickly and confidently with Adobe Illustrator software. Sophisticated tools for drawing and typography, along with advanced color controls and creative effects, provide a comprehensive vector graphics environment. Explore more efficient ways of working with multiple artboards, a Blob Brush tool for intuitive vector painting, and transparency in gradients with on-object controls. Stay ahead of the pace of change — equip yourself with precisely the tools you need for today’s print, web, interactive, motion, and mobile content design. »

Pencil is a standalone app or Firefox extension that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.

Affinity Designer is the fastest, smoothest, most precise vector graphic design software available. Whether you’re working on graphics for marketing materials, websites, icons, UI design or just like creating cool concept art, Affinity Designer will revolutionise how you work.

Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.

With vector illustration, page layout, photo-editing and tracing software, CorelDRAW Graphics Suite X7 is ideal for professional and occasional designers tackling any type of graphics project. Precision design tools, market-leading file compatibility and high-quality graphics content help you turn your creative ideas into professional results.

Adobe Fireworks is a bitmap and vector graphics editor.

Clip Studio Paint, previously Manga Studio or ComicStudio in Japan, is a family of software applications for Mac OS X and Microsoft Windows used for the digital creation of comics and manga.

Inkpad - Vector illustration app for the iPad.

Boxy SVG is a vector graphics editor simillar to Adobe Illustrator, Sketch and Inkscape. Made with and for the modern Web Platform. Can do illustrations, icons, banners, mockups, charts, buttons and more.

Free vector graphics software used to create graphics easily and intuitively.

Karbon, component of Calligra Suite , is the scalable vector drawing application in KDE. It allows artists to create complex drawings without losing image quality when zooming in on, or resizing the drawing. Graphic design ideas can be quickly and easily transformed into high quality illustrations with Karbon.

Xara Designer Pro X10 is a fully integrated single package solution for all your graphic design needs, for print and the web. Illustration, photo editing, DTP and document creation, web graphics and websites - Designer Pro does it all!

AutoDraw is an intuitive drawing tool for everyone. It's a Google Experiment project that provides relevant suggestions as you draw, based on what it guesses you're drawing.