The most invaluable tool that an SLP who works with people who stutter can own, goes by many different names; fluency rater, fluency tracker, stuttering counter or syllable counter. Essentially, this is a device which counts the number of syllables stuttered or %SS in a speech sample. It is a great way to track data and your client’s fluency progress.
FREE: Online Syllable Counter from Natke Publishing House, Germany.
SLP Disfluency Plus: A downloadable app by App-licable $2.99
Disfluency Index Counter: A downloadable app by Smarty Ears $8.99
Fluency Rater: A downloadable app by ForFluency $9.99
FREE: Stutter Rater for Android phones
Let me know if you find any more so that I can add them to the list.