POS Systems

The Search

• http://blog.stevecoinc.com/2010/02/open-source-point-of-sale.html

   Adempiere + Posterita
   OpenBravo POS
   L’âne (because the developer is local-ish)
   OFBiz (both the web POS and the java client)

Comercial

• http://www.positive-outcomes.com.au/

A Big List

• http://floreantpos.com

• http://spsbusiness.codeplex.com/ Use this Open Source POS - SPS POS System(
• http://www.sambapos.com/

SambaPOS

is a relative newcomer, but is moving fast. Developed in C#, LGPL license

http://www.sambapos.com/ 

LemonPOS

http://sourceforge.net/project/lemonpos/
http://lemonpos.wordpress.com/

Other Links

• http://ldn.linuxfoundation.org/blog-entry/another-area-linux-growth