Donor Management Systems
iMissions Pro is a free program that was created by an AGWM missionary and it works seamlessly with your monthly statements. You can import contacts, track giving, track conversations, and even submit reports straight from the program. Currently, it is only available for Mac.
MPDX is a free program created by CRU, formerly Crusade for Christ. It has much of the same functionality that iMissions Pro has, yet it is web-based and can be used by both Mac and PC. However, it doesn't work with your monthly statements, so you will have to manually input information to track giving.
Donor Manager is a free program that, according to their website, works with the giving statements from AGWM. It is Windows-based and therefore only available for PC.
Simple Sam is a really simple web-based program that allows you to track donors and pledges, but doesn't leave much room for anything else. There are some paid additions you can access, if you choose, for $14 a month.
The purpose of the program is to help you with tracking your goals and progress towards your fundraising, but doesn't allow much functionality beyond that.