Invision - Prototyping and collaboration for design teams
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.
Flairbuilder - FlairBuilder is a user interface prototyping tool for easy authoring of interactive website...
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Freeplane - Freeplane is a powerful and free software for building mind maps.