–> Excelente site com diversos modelos de dados.

Quotation Management System – e-Procurement

Google:

quotation management “open source”

rfq php “open source” quotation

cotacao electronica

electronic quotation system open source

Links:

http://simpleinvoices.org/

http://chirpy.sourceforge.net/

http://sourceforge.net/projects/litebilling/files/?source=navbar

http://www.e-pps.eu/view_category.php?catid=87

http://www.procserve.com/products/eprocurement/

http://www.leics.gov.uk/index/business/business_with_council/e-procurement/e-procurement_overview.htm

http://www.emeraldinsight.com/journals.htm?issn=2042-6747&volume=1&issue=2&articleid=1957307&show=pdf

http://sourceforge.net/projects/oquote/?source=directory

http://www.e-commerce.org.br/artigos/e-procurement.php

http://www.guiadecompra.com/guia/e-procurement.php

Images:

https://cw.sdn.sap.com/cw/servlet/JiveServlet/showImage/102-116834-1-4583/Folie3.JPG

http://scm.ncsu.edu/as/scm/i/channels/articles/scm/DIReprocure.gif