Twishort - Twishort is a best Twitter app for writing longer tweets. Tweet more than 140 characters
Privatter - Privatter is the easy way to share long texts and pictures set limit on your followers. You can post them by Sign in with Twitter account to this site.
Twitter text Splitter - Twitter text Splitter is a chrome extension that helps you to publish multiple tweets of your writing or a paragraph on your newsfeed.
5Tweets.com - Type a long tweet and 5Tweets will rewrite it into multiple tweets with a tweet count.
Fusetter - Tweet and hide spoilers! Also can tweet longer!
Chirr App - Chirr App 💬 splits text into tweets and posts it as a thread