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.
Git Sketch Plugin - Version control for designers
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Anima App - Design, get feedback, convert to code, publish, iterate.
Freeplane - Freeplane is a powerful and free software for building mind maps.
Marvel for Sketch - Sync, play and record prototypes in Sketch!