mEdit is a text editor with added functionality for combining several documents or worksheets together as a file or workbook. You can then quickly switch between the worksheet via your workbook tabs.
Equipped with all the useful editing tools plus additional information (meta data) can also be stored with the workbook such as when the worksheet was created, edited or last viewed, how many times the worksheet was edited, and label and comment attributes can be set for each worksheet.
Free for Mac OS X 10.3.9(Universal Binary) or higher.