BFS Pro is a program that helps to improve writing. It does this by substituting the words and phrases with synonyms. Most of the time, this produces some unintended results such as a change in the meaning of a line. To avoid these errors, the option "assisted spin" is present in the program. Here, the user can choose the right words or phrases of substitution from a list recommended by the program.
I like using this program because the MS Word application cannot find substitutes for a group of words (only word-synonyms are available in it).