MTA for Chrome - Switch between logged in Twitter accounts seamlessly.
Refined Twitter - A browser extension that improves the Twitter experience
Typefully - Write & publish great tweets, without distractions
Account Surfer - Quickly switch between accounts and browsers on Windows
Minimal Twitter - A distraction-free browsing experience for the new Twitter
Grouptweet - GroupTweet: Allow Multiple Contributors To Help Tweet From One or More Twitter Accounts