Creative teams depend on the free and easy flow of ideas to collaborate and inspire new thoughts. When you have to work digitally, these free apps help foster creativity and brainstorm fresh ideas. The most obvious starting point for creative brainstorming is to use a mind-mapping tool. This article won’t go into that because we’ve already reviewed the best free mind-mapping apps for single users or teams. Instead, we’ll focus on tools that ease creative collaboration across a range of fields, like design, writing, music, and more. 1. Red Pen (Web): Fastest Way to Collaborate on Images, Designs, and Mockups Red Pen is the fastest and easiest way to collaborate on images, designs, and mockups. Create an account, upload an image, give it a name and description, and you’re ready to go. Click anywhere on the image to start a new comment. Then share the link with collaborators. Anyone with the link can now see all the comments on it. You can mention other users in comments by addin...