Here is a list of active (and some not) ETPro public servers:
[!!!]Hirntot, 7 Map - 109.230.239.115:27960 (et.hirntot.org)
[!!!]Hirnlos, 10 Map - 109.230.239.116:27960 (et2.hirntot.org)
[!!!]Hirnfun - 109.230.239.116:27950 (fun.hirntot.org:27950)
(HBC)HELLBASKET ETPro3.2.6 - 78.129.185.48:27960
Some silEnT/ETPub/ETLegacy servers with settings close to ETPro (no bots (usually), no doublejump, no additional weapons...):
F|A HARDCORE FF ON - 108.61.18.108:27960
HOUSE OF ROX :EURO PUB - 95.172.92.98:27960
TeamMuppet ETLegacy - 37.187.79.49:27964
TeamMuppet ETLegacy 2 - 46.4.80.110:27960
ET:Legacy Original Maps Only - 37.187.79.49:27969