Board Thread:General Discussion/@comment-7826120-20131006161324/@comment-22434585-20150227032038

Yes, there is a mod for creative mode.

I believe that the devs have, of course, considered a creative mode; however, it does not really go into the scheme of Terraria (where it's all about the adventuring and the surviving). It is quite conceivable that in Terraria, where gameplay is more paced and regulated than Minecraft (though nowhere near as storyline'd as some RPGs) a creative mode would require incredible work to be free.