A somewhat new modded Terraria server up: 184.108.40.206:7777
To get in is very simple, just take your Terraria, open up the main folder and drop the contents of this: https://forums.terraria.org/index.php?threads/1-3-tmodloader-a-modding-api.23726/
into your main game folder.
After that's installed you just open up Terraria and go to the new "Mod Browser" section and search up these two mods "Thorium" and "Tremors". After that enable the two from the "Mods" section of the main screen and you should be able to join the server.
Right now it's still pre-hardmode so it shouldn't be at all difficult for people to catch up.