The USPTO has released a new version of its PatentIn program for sequence listings (Version 3.3). According to the patent office announcement, the new version offers easier sequence skipping, sequence type conversion, better database access, and better data validations.
USPTO Announcement.
Software Download (free).
PatentIn is a computer program designed to expedite the preparation of United States Patent and Trademark Office (USPTO) patent applications containing nucleic acid and polypeptide sequences. The program is designed to facilitate the creation of sequence listings for inclusion in patent applications sequences. It accepts data about the sequences, validates the data, creates a sequence listing file and a mechanism for printing out and saving to removable medium for submission.
(Mark Chael provided the link).