RTB was originally a large mod for the prototype of Blockland, at the time it was also called Vanilla blockland due to the fact that there were about 5 mods that transformed the game into something new or much better (it was also sometimes called v002 as it was an alpha). RTB was probably most played mod for the prototype and had many interesting features not available in the original prototype, and was the first mod that gave you all items when you spawned (in the prototype, there was no item-spawning OR vehicle-spawning from bricks). Once retail Blockland came out, RTB removed all links to the prototype and the RTB mod made for the prototype. Right now, the RTB staff that made the original RTB are working on RTB 2.0, a mod for Retail Blockland but centered on allowing communication and easy mod access.
I think that about sums it up.