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.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Twishort - Twishort is a best Twitter app for writing longer tweets. Tweet more than 140 characters
Standard Notes - A safe place for your notes, thoughts, and life's work
5Tweets.com - Type a long tweet and 5Tweets will rewrite it into multiple tweets with a tweet count.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.