Snapzu - Snapzu is basically reddit alternative.

Hemingway - Hemingway App makes your writing bold and clear.

4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.

Grammarly - Clear, effective, mistake-free writing everywhere you type.

Digg - Digg delivers the most interesting and talked-about stories on the Web right now.

Ludwig.guru - Linguistic search engine and contextualized translator. The final solution for your writing doubts!