I’ve added a LaunchBar action for Bunch, which you can find on the download page. Download, unzip it, then double click the unzipped action to install.
Selecting the Bunch action in LaunchBar and pressing return will list your available Bunches. If you have “Toggle Bunches” enabled, selecting a Bunch from the list will toggle it (quitting apps if it’s already been opened), otherwise it will simply open the Bunch.
See “Better Bunch for LaunchBar” for the latest changes to the Action.
Jay Miller has created an Alfred action for use with Bunch.