Free Tool: Monitor your environment with ControlUp
There are a lot of monitoring tools out there, but I recently came across a really cool free tool called ControlUp. ControlUp creates a unified and searchable grid view of all the users, sessions and processes in your environment and allows you to monitor, manage and troubleshoot your entire enterprise's application environment. This tool can drill down into Citrix XenDesktop or XenApp sessions as well. This is a really powerful tool, and best of all, it is free!