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.
TwitLonger - TwitLonger is the easy way to post more than 140 characters to Twitter
Chirr App - Chirr App 💬 splits text into tweets and posts it as a thread
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.
twtmore - Write a tweet too long? It's way over that dang 140 character limit? Use twtmore.