Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Hemingway - Hemingway App makes your writing bold and clear.
Fidus Writer - Fidus Writer is an online collaborative LaTeX editor especially made for academics who need to use...
TheRightMargin - TheRightMargin is a smart writing tool.
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.