Odoo is the world's easiest all-in-one management software. It includes hundreds of business apps:
CRM | e-Commerce | Accounting | Inventory | PoS | Project management | MRP | etc.
if i use odoo packaged installer and install all the apps and i have only 1 user in that then will it be free for unlimited period. Please help me.
If you download the Community version, you can use all the apps for unlimited number of users. but the one on the website has time limitation if you don't pay.
you can find the installation packages on https://nightly.odoo.com
For a review of the different editions of Odoo (and pricing) see https://www.odoo.com/page/editions