What are some alternatives?
When comparing AppHub and Marvel, you can also consider the following products
CodePush - CodePush is a cloud service that enables Cordova and React Native developers to deploy mobile app updates directly to their users' devices.
Invision - Prototyping and collaboration for design teams
Gihosoft Free Android Recovery - Gihosoft is a Free Android Recovery software that help recover deleted or lost Android files such as photos, videos, messages, contacts, WhatsApp, Viber, and more with simple steps.
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.
Parse-Server - parse-server. Parse-compatible API server module for Node/Express. JS, 14271, 3819. parse-server-conformance-tests. Conformance tests for parse-server adapters.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.