Keno,
Open tooling is an existing product mold that can be utilized by any person/company that wants to simply slap there logo or license name on it. It is not actually designed really except for slight modifications that might be done to alter the tool/product from another being sold. For example: if you wanted to sell sunglasses but don’t have the time to design them, you can find a manufacturer who probably has several generic tooling styles available for very low price. Thus eliminating the cost involved in creating “new” tooling as well as the need for design (your job).