Converting .txt files directly to .odt format.
Converting Plain Text Files directly to OpenDocument Text Documents (.txt to .odt conversion) is very straightforward, and is doable using pretty much any word processing software, such as Apache OpenOffice, AbiWord and many more.
Alternatively, you can simply copy and paste the text data from one program to another.
A free word processing program, part of GNOME office productivity bundle
Word processor and text editor from OpenOffice.org suite
Word processor web app from Google
One of the most popular word processor programs from Microsoft Office
Basic text editor distributed with Microsoft Windows
A full-featured set of office applications for Mac
A Korean word processor