The best alternatives to Vontigo are Payload, Webiny, and Craft CMS. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Vontigo?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Payload is a TypeScript headless CMS built to catapult your efficiency as a developer. From your config, Payload generates extensible REST, GraphQL, and Node APIs as well as a powerful React admin panel that your content editors will love.
Webiny is an open source enterprise CMS platform for users that are looking for great CMS experience, that is underpinned by unparalleled scalability, cost efficiency, infinite customization and data ownership through self-hosting.