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.
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.
Blurt - Compose efficiently. Edit smartly. Stay on track. Blurt is all you need to write — in one sleek tool.
LyX - LyX is a document processor.
Analyze My Writing - Analyze My Writing is an online text content and readability analyzer.