Sixty North AS

Mutation testing for Python

Multi-format report output for Python CLIs — JSON for machines, TSV for pipes, pretty terminal display for humans.

Invariant-preserving documents for agents that modify persistent state

Record and replay LangChain/LangGraph agent decisions preserving tools execution against the real filesystem

An example Demonstrable Deca project which uses a recorded and transcribed audio track

Source maps for YAML.

A Python package for programmatic creation of Python virtual environments

Les Itérables - a collection of utility functions for working with iterable series