I've been looking for an open source ERP system for a while, and have been following Marello recently. It looks like their demo is out now and I was wondering if anyone has tried it?
Hi @Francis Kim,
Thank you for looking into Marello! I've only just stumbled across your question now, a year later, but feel like I can still give you an answer 
Marello has evolved into a more mature ERP system over the last year. If you have any questions, or would like to get specific information, please do not hesitate to contact us through info@marello.com or via our website www.marello.com.
We'd be happy to be in touch!
Kind regards,
Marloes (Marcom @ Marello)
