CliWrap is a .NET library that provides a fluent interface and asynchronous API for executing command line processes. It addresses pitfalls in the System.Diagnostics.Process API related to deadlocks, race conditions, and inconsistent behavior across platforms. CliWrap provides abstractions for launching processes, redirecting streams, handling cancellation, and more. It is used by Microsoft, StackOverflow, and over 500 open source projects.