The Level Building Program Resource (download here) was created by Oleg Astakhov a.k.a. TheMask.
The program itself is no longer up-to-date, but all the tools are still online and browsable below (click on Tools).
A big thanks to Andy Secchi a.k.a. Wee Bald Man for uploading all these tools.

(Open LBPR in new page without iframe here.)