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.
Chirr App - Chirr App 💬 splits text into tweets and posts it as a thread
TwitLonger - TwitLonger is the easy way to post more than 140 characters to Twitter
Fusetter - Tweet and hide spoilers! Also can tweet longer!
5Tweets.com - Type a long tweet and 5Tweets will rewrite it into multiple tweets with a tweet count.
Twitter Threads - Twitter introduces a built-in Tweetstorm feature ⚡️