Job Schedule Management tools and techniques

My company has several SQL servers and a few other servers that run jobs, tasks and processes that affect our data. I would like to start managing these jobs as a big picture/view from above perspective. So, I would be able to schedule maintenance, downtime, special projects, optimize the processes, etc...

Are there any tools out there to help manage scheduled processes across servers? Ideally, I would like to see a ghantt-syle chart similar to the MS Outlook Scheduling Assistant, but I'm very open to other tools and ideas.