MiniStack (replacement for LocalStack) (ministack.org)

MiniStack is an MIT-licensed, open-source AWS emulator positioned as a free replacement for LocalStack’s now-paid core services. It aims to stay compatible with standard AWS tooling and focuses on running “real” infrastructure locally, including actual Postgres/MySQL via RDS, Redis via ElastiCache, and Docker containers via ECS. The project claims quick startup and low idle resource use while offering a broad set of AWS services over a single port.