To do Finance Management, I purchased AceMoney. It's one of the most complete software of its kind. For general productivity suite, I chose Sun OpenOffice.org. It has some performance issues, but is a complete software and usually performs very well. As for PDF Management, I got Adobe Reader and AnyBizSoft PDF Password Remover. They fulfill all my needs. For all other related tasks, like Math Operations, I use built-in applications from my Windows 7 Ultimate x86, like the (updated) Windows Calculator.