Formerly known as UBX Master. I am the maker of UT mods like the SWWM series, for example. I've been developing for the zDOOM engine for some time, but I'm thinking on returning to the ol' UT engine. Anyway, I have my own site now. Just go to freewebs.com/ubxmaster!
This is the list of changes as of 1.5, currently in progress. I guess I'll have it made for next week or so.
All I can tell about expansion pack 3 and future updates of base mod an other EPs is here.
Main changes in version 1.4, this is surely the definitive one.
Changelog for version 1.3 (probably final version?)
Changelog and status for version 1.1, as well as plans for next version.