FOSS for Small Medium Retail Businesses

Below is my favorite Free and Open Source Software for Small and Medium Businesses (especially retail).

Contact Management
SugarCRM


PBX
Asterisk / Trixbox


Accounting
Quasar


Enterprise Resource Planning
OpenBravo


Point of Sale
LibrePOS (formerly TINA POS, now acquired and renamed to OpenBravo POS)


Payroll/ Human Resources/ Scheduling
TimeTrex


Wiki
Mediawiki


Supply Chain Management
Compiere


Project Management
OpenProj


Office Suite
OpenOffice


Human Resource Management
OrangeHRM


Data Mining
Paterva


Web site development
Drupal


Digital Signage
Spectakle