If you are looking for free ERP in cloud, Bitrix24 is it. It comes with fully featured HR module, Sales Automation,
Document Management, Intranet Portal, Workflow Automation, Unified Communications, Social ERP and much more.
Bitrix24 ERP manual and online training videos are available here and here.
For a free online demo, self hosted Bitrix24 30 day trial or customization/integration requests, please contact Bitrix24 partner in your region directly.