Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Influitive - Influitive helps companies increase customer lifetime value and accelerate sales with the power of their own customer advocates. Inspire your customers to stay longer, share their experiences, and attract new business.

Woohoo - Increase conversions by replacing popups with mini games

Corsica - Corsica is the gamification app built on Salesforce for Salesforce. 

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

CRMGamified Motivation Engine - CRMGamified Motivation Engine is a gamification solution for Microsoft Dynamics CRM .