OpenCart + TradeGecko = Inventory Management

I'm currently looking for a sweet Inventory Management add-on that works like TradeGecko.

I like the TradeGecko system but they currently don't offer an integration with OpenCart - its apparently being planned. So in the mean time, can someone please suggest a solid alternative add-on that I can use? Something with similar features to TradeGecko? Which one works best in your opinion?

Thanks for the help!