Download of xListPro 5.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. XListPro for Mac relates to Productivity Tools. We recommend checking the downloaded files with any free antivirus. This software for Mac OS X was originally created by Adnx Software.
From the developer:
xListPro is a professional to-do list manager for multiple users. This app is a multi-users version of xList built for team collaboration. This application gives you everything you need to create team tasks, assign and schedule tasks, and track progress. All activities that are related to the member of a team appear in notifications.
You may want to check out more software for Mac, such as DaliClock, TimeMachineGrowler or SimpleDateCalc, which might be related to xListPro.