I have three good ideas. Help me choose idea 1, 2, or 3.
RobGR: I would do the idea that has the shortest time to producing money.  I suspect that's number two, the overseas buyer system.I would avoid the security analysis tool.  The customers sound troublesome, and the competition is likely to be on grounds of the niceness of the reports or something rather and technical correctness.  The field has a lot of snake oil, and to be competeing against snake oil with a real product is not necessarily a good position.The performance analysis tools for linux are needed and might make a good product, BUT: don't do this unless you have a paying customer who wants you to write some high-performance code, and you will be abl to use free distribution of the tool to get more jobs like that.The overseas buyer is the way to go.  Try to get something that is mostly self-service, where you allow buyers to meet sellers and they handle most of the stuff between themselves.  Since you will have a web site describing lots of desired goods and visitors who are looking for those goods, you might be able to get some income from adwords.All the potential hassels described by other folks about that idea apply, but none of them have not been solved before by other import/export people.  There are also many regional products in the US that might be distributed this way, such as local brands of BBQ sauces, beer (again the possible legal issues), etc.  However none of this is things that Ebay, craigslist, and etsy haven't dealt with.