Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
SuperNotecard - Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.
Vecteezy Editor - Free Online Vector Editor - Design and customize SVG illustrations and graphics quickly and easily in your browser.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Freeplane - Freeplane is a powerful and free software for building mind maps.