Sitemap Generator: Create a Sitemap of your site compatible with all search engines, not just Google.
W3C Markup Validation Service: This is a free service that checks Web documents in formats like HTML and XHTML for conformance to W3C Recommendations and other standards. Extremely helpful in checking out why your page has errors.
Keyword and Meta Tag Tools:
Meta Tag Generator: This simple little program will generate Meta Tags for you very quickly and easily. Simply enter your site’s description and keywords in the appropriate places. No coding worries! SEOptimer has tons of helpful tools!
Keyword Research Tool: This tool will help you research appropriate words and phrases to include in your webpage’s body text to aid in promotion.
URL Inspection Tool: An on-line tool which checks if your pages have a defined topic and Inspect your URL. Free.
MOZ Spam checker: The Spam checker is an excellent tool to judge if a site is worth checking out as a possible link exchange partner. It does an excellent job of listing the pros and cons, including PageRank, of any URL you feed it. Free.
AddMe: Link Popularity tells you how many websites are linking to yours. Website popularity is important, as many search engines are using this information as a ranking criterion. The more popular your site is, the better it can be ranked on the search engines. Free.
Add This: AddThis helps you promote your content (web pages, feeds, products, podcasts, etc) online by making it easier for your visitors to collect it, save it, and distribute it to social services (think “social SEO”, or SMO – Social Media Optimization).
Validators:The W3C also offers other validators, you can even check for broken links or validate your the CSS on your site.
Image & Link Analyzer: This online program will check your spelling, links, images, tables, and more. Highly recommended.
Feedly: A free web based RSS feed writer. A handy wizard that sets up your feed so there’s no worrying about coding issues. Free.
Feed Validator Once you’ve got your feed up and running you can validate it here to make sure everything is running smoothly. Gives you hints on how to fix your feed if it fails to validate. Very useful. Free.
RSS Cache: RSS Cache lets you cache your feed through them, saving bandwidth.
Online Banner Creator: You’ve got to check this place out! If you know what you want out of a banner – go here. It may take a while to learn how to use this online program, but once you figure it out, you may never want to leave.
216 Color Web Safe Palette: Need a perfect color quickly? Bookmark our color palette for a quick color fix. Includes HEX and RGB values. Free. Highly recommended.