Applescript which makes sure an application keeps running, with options to activate/hide the app.

KeepThaAppRunning.scpt

on appIsRunning(appName)
	tell application "System Events" to (name of processes) contains appName
end appIsRunning

on hideDock()
		tell application "System Events"
			keystroke "d" using [command down, option down]
		end tell
	end hideDock

on hideApp(appName) 
	tell application "Finder" 
		set visible of process appName to false 
	end tell 
end hideApp 

 on showApp(appName) 
	tell application "Finder" 
		set visible of process appName to true 
	end tell 
end showApp 

on makeActive(appName)
	tell application appName 
		activate
	end tell
end onMakeActive

repeat
	if appIsRunning("ApplicationName") then 
		makeActive("ApplicationName")
	else
		do shell script "open -a /path/to/ApplicationName.app"
	end if
	delay 10
end repeat