Edit: this is actually a 3rd party addon!
'Playmaker' just got released for Unity, a way of visually scripting an application. Have a look:http://u3d.as/content/hutong-games-llc/playmaker/1Az
It appears to be a fairly simple flowchart - I don't think it does anything like instance picking, and I'm always skeptical of tools that try to let you code in 2D, placing stuff in a large area (doesn't it get messy?). So I wouldn't call it a competitor just yet, but it's still interesting.