Artboard Studio - Online graphic design app mainly focused on product mockups.

Xmind - Xmind is a brainstorming and mind mapping application.

Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.

MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.

Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.

Coggle - Coggle is a simple, beautiful, powerful way of structuring information.