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
Twishort - Twishort is a best Twitter app for writing longer tweets. Tweet more than 140 characters
Thread Reader - A bot 🤖 that unrolls Twitter 🐣 threads for you 🤓
5Tweets.com - Type a long tweet and 5Tweets will rewrite it into multiple tweets with a tweet count.
tweedium - Transform your tweetstorms to Medium posts