The best free alternative to Marvel is Figma. If that doesn't suit you, our users have ranked more than 50 alternatives to Marvel and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Marvel are InVision (Freemium), Moqups (Freemium), Origami Studio (Free) and STUDIO (Freemium).
Atomic puts advanced interactive design features like logic, data, and variables, into the hands of every designer. Import from your favourite design tool, or start from scratch in Atomic. Add gestures, user inputs, events and keyboard interactions.