These resources will be organized by alphabetical order. I found these resources over my various years of writing. If you have any resources you would like to share, link in the comments with a short description of what the resource is for. 

Dictionary.com

An online dictionary that also connects to a thersaurus.

Fantasy Name Generators

It is amazing for a fantasy work. It has species based fantasy names and descriptions of fantasy places.In addition to that, it has alien names, ethnicity/race based names, and descriptions of animals.  

On the Tip of Your Tongue

This site allows you to find the word that you know the meaning of because cannot remember the exact word for. You can search up the word haunting you using the part of the word, letters in the word, length of the word, and/or what the word sounds like.

Thesaurus.com

An online thesaurus that connects to a dictionary.