Massive vs Stellar: What are the differences?
Developers describe Massive as "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. On the other hand, Stellar is detailed as "Fast database snapshot and restore tool for development". Stellar allows you to quickly restore database when you are e.g. writing database migrations, switching branches or messing with SQL. PostgreSQL and MySQL are supported.
Massive and Stellar can be primarily classified as "Database" tools.
Massive and Stellar are both open source tools. It seems that Stellar with 3.58K GitHub stars and 108 forks on GitHub has more adoption than Massive with 2.55K GitHub stars and 194 GitHub forks.