You will find retirement planning modules in most comprehensive software such as Quicken and Microsoft Money, and some budget-specific software like You Need A Budget include a retirement planner. Plan as you might for retirement, you still need a budget after retirement. Some of you are thinking, "budget after retirement--when will it end!" Well, sorry to say it, but as long as you are walking the Earth, you need to continue to plan your spending. You need to budget after retirement.
Retirement Budgeting Resources from About Retirement Planning: Budget Goals for Retirees | Retirement Budgeting Made Easy
Personal Finance Tools for Retirement Budgeting: Budget by Snowmint LLC | Quicken | Microsoft Money | You Need A Budget