Invision - Prototyping and collaboration for design teams
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Proto.io - Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.
Tyke - Mac menu bar app that @torrez really needed to take notes
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.