http://lnxstudio.sourceforge.net/
pre-announcement since it's not yet available for linux. From the cdm comments:
Neil Cosgrove wrote: Hi. Yes we are working on the Linux version at the moment but it still needs a bit of love. We got about 90% of the features working so it will be a month or so before you'll see anything solid. As for a PC version... Yes, but not right now. There are a few other thing I want to do 1st. Maybe later on in the year when I get more time.