Popper

Abstractions over Docker, Podman, and Singularity allow workflows to run unchanged across different container engines, enhancing flexibility.

Generates configuration files for multiple CI services from a single YAML definition, reducing lock-in and ensuring consistency in testing pipelines.

Uses a simple, Docker Compose-like YAML format to define steps, making it easy to read and write without complex scripting.

Provides a rich collection of pre-built workflows for various languages and test types, accelerating adoption and reducing setup time.