RGPSoft Calus 2012 is a free open source, licensed under the GPL, written in Microsoft Access© for inventory management and in particular for loads, discharges and yields. The application is completely written in VBA, the programming language Visual Basic Microsoft Office© and has no macros because they are not considered as powerful as a real programming language.
When the program presents the main menu window with which you can choose the operation to be done, add or modify inventory items, enter a load, a drain or a surrender by the customer, all very simply. Other operations that can be performed are the prints of the report for the warehouse, inventory and reorder the goods. Last peculiarity of the program is the ability to look up the values between the movements made previously and export data in Microsoft Excel©, of course, for those with a full suite of Office.
The application is constantly changing and can be easily customized to your needs, just knowing the language Visual Basic.
The program in source code under the GPL license can be found on this page, or you can follow the tutorial to create it from scratch.