Twitter One Click Block - Add a block button for a simple one click blocking.
Block Together - A useful tool which helps you block trolls on Twitter.
Likers Blocker - Likers Blocker is a browser extension that lets you block all the followers and the people who like a specific tweet on Twitter.
Moderate - Identify, mute, and block trolls in your Twitter feed
Twitter Block Chain - Chrome extension to block all followers/following on a page
Boyfairy - Your opportunity to educate right before you block someone.