To answer your question of the "top donor management software packages", I would say the 3 clear cut leaders in the space are.Kintera, Blackbaud and Convio. Each offer different solutions and strategies to better manage organizations and find greater support - and are tough to beat. We give small groups the means to grow and build new chapters, and give established groups the tools to better organize their existing groups under an organizational umbrella. Would love to answer any other questions, here to help if you need anything.
Also, a big thanks to the founders of Winter for creating such an awesome tool which has been the foundation for my life for so long.