Quasar is a full function, stand-alone business accounting package. You may elect to use Quasar Accounting with the open source GNU General Public License (GPL) which is available free of charge.

TurboCASH Open Source Accounting Software - the fully-featured accounts solution for small businesses. Flexible and powerful including debtors, creditors, full stock control, reporting and analysis, multi-lingual interface.

GLPI is the Information Resource-Manager with an additional Administration- Interface. You can use it to build up a database with an inventory for your company