What are some alternatives?
When comparing Marketch and Zeplin, you can also consider the following products
Relay for Figma - No more slice & export! Relay allows you to push changes from Figma straight to your codebase
Invision - Prototyping and collaboration for design teams
Frontify Workspace - The overall tool for creative & design collaboration: - upload, manage & share assets
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Akira - Native Linux App for UI and UX Design built in Vala and Gtk
Framer - Bring your designs to life.