Flectra is a suite of web based open source business apps forked from Odoo.
The main Flectra Apps include an Open Source CRM,Website Builder,eCommerce,Warehouse Management,Project Management,Billing & Accounting,Point of Sale,Human Resources,Marketing,Manufacturing,Purchase Management and many more.
Flectra Apps can be used as stand-alone applications, but they also integrate seamlessly so you get a full-featured Open Source ERP when you install several Apps.
For a standard installation please follow this gist.