Block Together - A useful tool which helps you block trolls on Twitter.
SynapseInteractive - SynapseInteractive offers an array of services and solutions aimed at promoting businesses.
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.
Loganix - The most powerful spam blocker
Moderate - Identify, mute, and block trolls in your Twitter feed
TheHOTH - The HOTH is a white label SEO service built specifically for agencies, in-house SEOs, and affiliates.