Simple interface full of deep tools, including the "Unfollow" tool to sort through people you follow on Twitter in about a dozen ways. The "Follow" tool helps you find users based on things you specify, such as "Users Who Follow @____". Power Mode gives an exhaustive number of filters on your Twitter search (over 25 filters), such as influence, follower:following ratio, how often they tweet, keywords in bio, latest tweet, etc. PowerPost is a beautiful tweet scheduling tool, and gives the deepest analytics I've ever seen on the short-URLs they provide. @Inbox feature turns your mentions into an email-like interface. You can also track tweets and keywords, click on the graph once the data's pulled up, and see the individual tweets, or tweet clusters. Google+ Sync allows your Google+ posts to be delivered as Tweets automatically. Also the developers are hilarious and awesome - since Twitter made the change so that you now have to manually click every action you do via 3rd-party apps (such as follow, unfollow, or block), it's gotten time-consuming to do that. ManageFlitter's team not only built a simple interface for executing hundreds of those clicks as fast as possible, they also have a video player of documentary footage, like nature or space documentaries... Classy. I will never find a better-built, more comprehensive tool for Twitter. At least, it will take a long time. If you have clients who want to use it for theirs, you can still add their Twitter account to your account and set it under a group (if you have a Business account), then they can log in with their Twitter account and only see that account.