PartKeepr - PartKeepr is an open source inventory management system that you can alter according to the particular requirements of your business or of the area from where you are operating.
Stockpile - Stockpile is a free online inventory system for small business and at home uses.
Skyware Inventory - Web-based Inventory Management.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
inFlow Inventory - inFlow Inventory is inventory management software for small businesses.
Inventoria - Easily organize and track the inventory for your business for free. Set warning levels and run reports to insure that your stock is always at an optimum level.