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
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.
Tall Tweets - Tall Tweets, now with support for 280 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.