Free Word Processor:

OpenOffice is a word processor fairly similar to Microsoft Word that is completely FREE for download, and has a built-in spellchecker.

http://www.fanfiction.net/oo/

If you aren't able to download/install programs on your computer, there are also many online spellcheckers available, such as http://www.spellcheck.net.

Online Dictionaries:

Standard Dictionaries/Thesauri: http://www.dictionary.com, http://www.m-w.com/
Slang Dictionary: http://www.urbandictionary.com
Etymology Dictionary: http://www.etymonline.com/

General Online Resources for Character Stats:

Character Names: http://www.behindthename.com, http://www.20000-names.com
Character Surnames: http://surnames.behindthename.com
Online Encyclopedias: http://www.encyclopedia.com/, http://www.britannica.com/, http://www.infoplease.com/, http://www.wikipedia.com *
World Pantheons: http://www.godchecker.com

* Many of the articles found in Wikipedia are submitted by general Internet users, and may not be entirely correct. Use at own discretion.