A full featured accounting package with accounts receivable, accounts payable, customer and vendor management, and inventory control journal. http://www.freeaccountingsoftware.net
Check Writer, mailing list, note writer, federal payroll tax calculator and payment calculator. Plus links to other software vendors. http://www.rkom.com/free.htm
A robust multi-user inventory business management system and accounting software that includes inventory, customer management, vendor management, A/R, A/P and comes with extensive reporting tools. http://www.cs-inventory-software.com