GNU Aspell/Aspell is a free and open source spell checking software for Linux and Windows. It is released under GNU Lesser General Public License. It is not only a simple spell checker, you can also get the possible replacements for a misspelled word in Aspell. You can add Aspell in your program as a library. It supports UTF-8 and you can use multiple dictionaries at once. In this article, we will see how to install and user Aspell on Ubuntu.