Adds 8 (15 counting variations) new turrets for dealing with alien menace, as well as other military-related items. Good compliment to mods that add new biter types, like Rampant or Natural Evolution.
Broken how? Latest factorio version is 2.0.28 (released december 20), latest mod version is 8.0.7 and plays just fine on my end. There WAS an issue where Factorio version 2.0.25 enforced UTF-8 encoding for localization files, but that's been fixed with 8.0.7 update.
I can confirm this, let me just grab a crash log.
Edit: In my case it's because the server's running an outdated version of Modular Turrets.
Strange that the last game update broke it now though.