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Cassowary.net is a port of the Cassowary constraint solving toolkit to the .NET platform. It is based on the Java version by Greg J. Badros, which in turn is based on the Smalltalk version by Alan Borning.

Cassowary.net is free software: it is licensed under the GNU LGPL.

Quoting the Cassowary website:

Cassowary is an incremental constraint solving toolkit that efficiently solves systems of linear equalities and inequalities. Constraints may be either requirements or preferences. Client code specifies the constraints to be maintained, and the solver updates the constrained variables to have values that satisfy the constraints.

Cassowary.net is used by Uiml.net for its layout management extension.

More information (downloads, documentation, etc.) can be found at the Cassowary.net website.