Hi all,
After some beta testing, I have recently shared my software to synchronize inventory between the BrickLink and BrickOwl marketplaces. It runs on a seller's own computer, handles orders both ways, everything is saved as BrickStock compatible BSX files, and it should be rock solid against anything (even yanking on the ethernet cable in the middle of an update, a power cut while writing a file, etc.). So, there it is: http://www.bricksync.net/
My original plan was to make it open-source and donation-supported, but various people commented that very few people would donate if they could avoid it. Well, they were probably right! So, the only limitation is that a seller with over 250000 items will be kindly invited to support BrickSync, otherwise a little math question/puzzle will be asked to check for new orders. (I still plan to release the code under a General Public License if the donations reach a certain amount.)
So, better plan ahead for the extra workload of doubled sales! And If you become rich and famous thanks to the software, please remember that it's primarily donation supported. Thanks.
Stragus