Storyboarder is described as 'Makes it easy to visualize a story as fast you can draw stick figures. Quickly draw to test if a story idea works. Create and show animatics to others. Express your story idea without making a movie' and is a digital painting tool in the photos & graphics category. There are more than 25 alternatives to Storyboarder for a variety of platforms, including Windows, Web-based, Mac, iPad and iPhone apps. The best Storyboarder alternative is LibreOffice - Draw, which is both free and Open Source. Other great apps like Storyboarder are LibreOffice - Impress, OpenToonz, Clip Studio Paint and OpenBoard Whiteboard.
Slipshow is a tool specifically designed for technical presentations where traditional slides are not enough.
Slipshow is the most popular Self-Hosted alternative to Storyboarder.