Odoo is a suite of web based open source business apps.
The main Odoo Apps include an Open Source CRM, Website Builder, eCommerce, Project Management, Billing & Accounting, Point of Sale, Human Resources, Marketing, Manufacturing, Purchase Management, ...
Odoo 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 the Setup instructions from the documentation.
If you are a developer you may type the following command at your terminal:
wget -O- https://raw.githubusercontent.com/odoo/odoo/9.0/odoo.py | python
Then follow the developer tutorials
To add the odoo-dev remote use this command:
$ ./odoo.py setup_git_dev
To fetch odoo merge pull requests refs use this command:
$ ./odoo.py setup_git_review