MINERVA's system was used in Someplace Else, which in turn reuses the GoldSource/Source system to display chapter titles and credits. It's based on
Env_message. There is a bunch of parameters which will allow you to change the look of the messages and make them less "Fosterish." :-)
The Ravenholm mod used this system as well, instead of closed captions. The mod also featured a "paper notes" system, but I'm not sure how it worked.
For the love of all that is good and holy, don't use
Game_text. It's... wrong on many levels.