I have found a new one, named NetRadiant, a stabilized Radiant 1.5 (come with the game "Nexuiz")... I found only one bug in this program and tell it to the author, if he can correct this, I'm planing to promote it
There are some additionnal feature that does it well (for example, you can choose to lock texture coordinate or not, while moving brushes).
Its main advantage is that it works under Linux (I never found a working 1.4 under linux). I have noticed that many new player use this OS.