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.
Twishort - Twishort is a best Twitter app for writing longer tweets. Tweet more than 140 characters
Chirr App - Chirr App 💬 splits text into tweets and posts it as a thread
5Tweets.com - Type a long tweet and 5Tweets will rewrite it into multiple tweets with a tweet count.
TwitLonger - TwitLonger is the easy way to post more than 140 characters to Twitter
Fusetter - Tweet and hide spoilers! Also can tweet longer!