[FinalBuilder Professional Edition]
The Spell Check action allows you to check a text file for any spelling errors (ie. unknown words).

Select the source to check spelling of:
Text File - specify a text file
FileSet - specify a FileSet to use. Make sure that only text files are included in the FileSet
Text - enter text to check. You may use variables here which will be expanded first.

Options
Fail if unknown words found - setting this will fail the action if one or more words are unknown
Write unknown words to file - Any unique unknown words found will be appended to the specified text file. The file will be created if it doesn't exists.
Log unknown words - each unique unknown word will be written to the log
Words to Ignore
Ignore HTML/XML tags - this will ignore words inside "<" ">" tags. eg. <speeling>errror</speeling> will only test the word "errror" and ignore "speeling"
Ignore words containing numbers - this will ignore words like "3ware"
Ignore URLs and e-mail addresses - this ignores words that start with an internet protocol like "http://" and also words that contain the @ symbol.
Ignore fully uppercase words - this will ignore words like "SHOUT"
Ignore words from text file - each line of the file is interpreted as a word and will be ignored
Custom dictionary - you may specify other Addict dictionaries to use. See here for other dictionaries: http://www.addictivesoftware.com/dicts-extern.htm
Ignore Specified words - add other words to ignore, one line per word