POP (Prototyping on Paper) - POP helps you make interactive prototype with ease. If you can draw, you can design apps.
Chirr App - Chirr App 💬 splits text into tweets and posts it as a thread
Invision - Prototyping and collaboration for design teams
Thread Reader - A bot 🤖 that unrolls Twitter 🐣 threads for you 🤓
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
tweedium - Transform your tweetstorms to Medium posts