What are some alternatives?
When comparing Strapi and Contentful, you can also consider the following products
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
Prismic - prismic.io is a web software you can use to manage content in any kind of website or app. API-driven.
Marketing 360 - Marketing 360® is a powerful marketing and website platform built for any size brand. It's fully managed and has everything a brand needs to drive beautiful marketing and sales.
Sanity.io - Sanity.io a platform for structured content that comes with an open-source editor that you can customize with React.js.
Onehub - Onehub helps businesses securely share and control files in the cloud.
GraphCMS - The GraphQL Headless CMS