Twilight & Podium are based on the Kerkythea engine, The people behind Twilight & Podium they've licensed the Kerkythea SDK...in other words you should be able to get the same results with Kerkythea for FREE, if you don't mind the GUI...also note that Kerkythea it may not develop much since the developer is putting his effort to the new engine (Thea Render).