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

Reverse Dictionary - Describe a concept and get back a list of words

Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.

Meaning Monkey - Find the definition and meaning of anything.

Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.

Silicon Valley Dictionary - Urban dictionary meets Silicon Valley