Search in the whole forum (replace term1 term2 with your terms):
https://www.google.it/search?q=site%3Aoriginaltrilogy.com%2Fforum+term1+term2
Search only in thread titles (replace term1 term2 with your terms):
https://www.google.it/search?q=site%3Aoriginaltrilogy.com%2Fforum+allintitle%3Aterm1+term2
Project lists (not comprehensive, but a very good start point):
other projects
http://originaltrilogy.com/forum/topic.cfm/Project-Index-Other-Preservations-and-Fan-Projects/topic/11159/