Lambda (Cloud Functions), S3 (File Storage), Amplify Console (Hosting with CI/CD and HTTPS), AppSync (Realtime GraphQL), and Cognito (Auth) are probably the most relevant things to front-end developers.
More of a major infastructure provider in vein of Amazon Web Services than a toolkit for building out an app like Firebase is.
Google Firebase is very powerful while being very easy to use. For example, you can run cloud functions, but you don't even need to for most data storage and retrieval or auth. It might be expensive to scale on though.
A major infrastructure provider with solutions for about just everything, and generally considered the least expensive. For working with cloud functions, there is an online editor, but it also allows GitHub sync and integrates directly with VS Code. Data storage is through Cosmos DB.
Netlify is an all-in-one workflow that combines global deployment, continuous integration, and automatic HTTPS. Netlify allows you to build, deploy, and manage, modern web projects with local development, functions and smooth development experience.