Sure! We evaluated several anomaly-detection tools & libraries. They included:

tried-and-true statistical methods like probability density functions

Yahoo EGADS anomaly-detection library

Numenta HTM neural-network anomaly-detection library

We ruled out HTM due to AGPL licensing concerns. It's an interesting product, but wasn't a good fit for us at this point in time. EGADS and other basic statistical methods can actually get you pretty far.