Quartz Enterprise Scheduler .NET
http://www.quartz-scheduler.net/
Walkthrough: Scheduling jobs using Quartz.net – Part 1: What is Quartz.Net?http://geekswithblogs.net/TarunArora/archive/2012/04/10/walkthrough-scheduling-jobs-using-quartz.net-ndash-part-1-what-is.aspx