Moneyworks is the greatest Off-The-Shelf package accounting solution. Scalable, with flexibility to do own scripting, and simple enough for non-accounting or technie person to manage accounting and inventory management.
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
AccountEdge - AccountEdge is small business accounting software for Mac, Windows, and Mobile.
CrankWheel - Insanely simple, enterprise-friendly screen sharing, free for individual use.
QuickBooks - Business runs better with QuickBooks, the #1 accounting solution for small business.
Denali (Cougar) - Denali (Cougar) is software develops leading on-premise accounting solutions for small to mid-sized businesses.
Xero - Xero is online accounting for your small business.