I know the topic is kinda old, but just since I mainly play etpro, I thought I might as well post a few popular servers I play on.
(All ETPro, but euro :/)
[!!!]Hirnlos, 10 Map
188.40.88.104:27960
NS ETPro Server (SW)
91.189.136.7:27965
#et-merc.fr + Funzone +
87.98.242.56:27960
[ N e X u S ] ET - 03 - [ETPro 3.2.6]
88.198.69.3:27960
Happy fragging ^^