The isodoc class can be used for the preparation of letters and invoices (and, in the future, similar documents). Documents are set up with options, thus making the class easily adaptable to user's wishes and extensible for other document types.

The class is based on the NTG brief class by Victor Eijkhout, which implements the NEN1026 standard.

The author is Wybo H. Dekker. The package is Copyright © 2014 Wybo Dekker.