BE.WEAPON - Armory Management
BlockParty - Real-time voice chat rooms from the creators of turntable.fm
Shield - Facebook & Instagram comment moderation from Slack
Red Block - Red Block is a browser extension that lows you to block users from your Twitter account.
ASPISWMS - Armory Management
Secateur - Use Secateur if you want to temporarily or permanently block or mute (or both block and mute) a Twitter account and all its followers.