Mockae
Open source mock REST API server scripted in Lua
Pythonium’s Data maker
Online test data generator scripted in Python
Keploy
Open source tool that turns application traffic into tests and mocks
Datagaps ETL Validator
ETL and data pipeline testing tool, part of the Datagaps DataOps Suite
Schemathesis
Property-based API testing from OpenAPI and GraphQL schemas
Faker
Python package that generates fake data