I am in a business, and the company I am in uses SAP.
Are there any applications like SAP available for Ubuntu?
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I use this: http://www.manager.io/
Works well, simple but good for small businesses
The 2 leading ERPs in the Open source world are:
OpenBravo has become quite a bit commercial, and in my opinion, lost its open source friendliness... Odoo looks more open source friendly, but is slowly approaching OpenBravo's business model.
Odoo offers SaS (Software as a service), by which if you are a small company and want to start trying this, you can pay them monthly a few dollars, and they will host the service for you. You will have all your data "in the cloud".