Guess it depends how many features you want... Zoho creator works ok, at least for asset management and has an easy api if you want to do something crazy. There's this thing too, if you want something more advanced, and it is open source: odoo and then click download But if you want easy to use, just browse bitnami for something.
Both Tracmor and Vtiger are open source inventory management software that would help to organize, grow sales, deliver, etc.
You can use GOIS-PRO (Goods Order Inventory System Pro) to manage your inventories. GOIS-Pro is an efficient and user friendly Web and Mobile application, for iPhone, iPad, and Android devices that allows small to medium sized businesses and individuals to manage, track and transfer their Products, Sales and Purchase Orders, Inventory and Sales, Vendors and Customers, Business and financial reports across multiple Business units and Inventories.