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.
CleanSpeak - Keep inappropriate content and trolls out of your community
Block Together - A useful tool which helps you block trolls on Twitter.
Moderate - Identify, mute, and block trolls in your Twitter feed
BlockParty - Real-time voice chat rooms from the creators of turntable.fm
WebPurify - Profanity Filter, Image Moderation and Video Moderation Services Made Easy.