Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
MadCap Flare - Documentation for Any Audience, Language or Format
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Yumpu.com - The UK’s favourite all-inclusive online magazine package
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.
Readymag - Readymag is a design toolkit that helps create immersive digital experiences without developers in days, not weeks.