Ill be explaining some bigger features:
-Verification System - gives a user a certain role when reacting to verification message(Captcha sometimes required).
-Economy - has a currency called blob, a shop and commands as 'beg', 'crime' and 'work'.
-Music - has a nice looking music controller and plays music with nearly no 'outage' and latency
-Moderation - Basic commands such as 'un/-mute', 'un/-ban'and 'kick' and advanced ones such as 'massban' and 'multiban'
-Automoderation - A system to detect unwanted behavior check ?help automod for more info
-Antialt protection - A system to protect your server from potential alts, check ?help antilalt for more info