HI , ERP implementation expert is here, i have more than 6 year experience in ERP implementation of Various kind of ERP like Oracle Financials, and Many other Open Source, my 1st Options is Frontaccounting it is web base ERP and i have 2 year piratical experience of it, this is module system having all core areas of ERP. i can provide customization of Frontaccounting if necessary.
2nd Option is Web ERP this is also open source
Regards,
Salman Sarwar