User role synchronization. Apply a role or group in-game and you'll see it on the website and vice versa. Compatible with Garry's Mod and Rust.
Store bans from all your servers in one central database and choose which apply where.
Ember is modular and easy to customize. Simply choose the features you need from the admin panel or write modules in PHP.
Ember is completely self-hosted (save for OAuth & CDNs), reports no telemetry data and includes unobfuscated source code.