Massive vs PostgREST: What are the differences?
Massive: A Postgres-Centric Data Access Tool. Massive's goal is to help you get data from your database. This is not an ORM, it's a bit more than a query tool - our goal is to do just enough, then get out of your way. Massive embraces SQL completely, and helps you out when you don't feel like writing another mundane select * from statement; PostgREST: Automatic REST API for Any Postgres Database. PostgREST serves a fully RESTful API from any existing PostgreSQL database. It provides a cleaner, more standards-compliant, faster API than you are likely to write from scratch.
Massive and PostgREST can be primarily classified as "Database" tools.
Massive and PostgREST are both open source tools. PostgREST with 12.5K GitHub stars and 585 forks on GitHub appears to be more popular than Massive with 2.55K GitHub stars and 194 GitHub forks.