Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
Zeplin - Collaboration app for UI designers & frontend developers
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
Abstract - A secure, version-controlled hub for your design files
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #