Ginger and Grammarly are examples of software that checks grammar for free, both of which are available through GingerSoftware.com and Grammarly.com, respectively. Alternatively, users can download an open source office suite, such as Apache OpenOffice, and install the After the Deadline extension that performs a grammar and style check.
GingerSoftware.com allows users to test the grammar checker and peruse the list of features, including translation, dictionary, text reader and a sentence rephrasing tool. Grammarly works on most social media websites, including Facebook and Twitter, by automatically correcting the detected mistakes in the text field. The developers of the software claim that Grammarly is able to correct over 250 different types of mistakes in addition to improving poor vocabulary and rectifying contextual spelling errors.