Aspell is a smart spell-checking software that detects errors in the text, offers suggestions for corrections, and checks grammar. It is licensed under GNU GPL and supports over 70 languages.
First off, this project can either be used as a library or as an independent spell checker. So, whether you need to integrate it into an application or use it as a standalone tool, it's versatile enough to work for your specific needs.
One of its strongest selling points is that it's exceptionally good at suggesting possible alternatives for a misspelled word. In fact, many users have reported that Aspell is better than any other spell checker out there for the English language.
Another feature that sets it apart from Ispell is its ability to check documents in UTF-8 format without requiring any special dictionary. And, it's generally quite respectful of the current locale setting, so you shouldn't experience too many issues with compatibility.
On top of all that, Aspell allows you to use multiple dictionaries at once. Plus, it has a useful capability that intelligently handles personal dictionaries, even when multiple Aspell processes are running.
Overall, GNU Aspell is a solid option for anyone in need of a reliable, Free and Open Source offering for their spell checking needs.
Version 0.60.4: N/A