Php Form Generator:

http://phpformgen.sourceforge.net/new_demo/phpformgen/

This is great for making mailto forms. You can build forms with radio boxes, dropdown lists, text boxes, text areas, an so forth. It even supports file upload. Best of all - it's free to use. 

CSS Layout Generator

http://csscreator.com/tools/layout

This is usefull for making CSS layouts for your site.

Type Tester 

http://www.typetester.org/

This site lets you play around with different fonts, sizes, etc and then generates the CSS file for you. This is brilliant because it lets you see beforehand what works on a website, and what doesn't.

960 Grid CSS Frameset

http://960.gs/

If there is ONE thing on this list you should check out - it's deffinately this one. This CSS frameset allows you to create a massive amount of different layouts using a predefined set of CSS Div Tags. You can choose between a 12 or a 16 column layout, and the possibilities are almost endless as to what you can do. And all layouts will be Web 2.0 compliant, as it doesn't make use of Tables.

Backlink Builder

http://www.webconfs.com/backlink-builder.php

Use this "Search Engine" to find sites with the same keywords as yours, and build links back to your site. Invaluable for SEO.

SiteMap

http://www.xml-sitemaps.com/

Make a sitemap for your website on this website.

SiteMap Ping: 

http://www.seroundtable.com/archives/013113.html

Here you will find a list of URL's you can use to notify the search engines of your new sitemap, and ping them so that they will come and crawl your site. 

Web Scripts

www.dynamicdrive.com

A large collection of code snippets and web scripts you can use in your designs. No membership/fees - everything is free to use.

Meta Tag Generator 

http://www.submitexpress.com/metatags.html

Get your meta tags done - right.

Site Submission: 

www.freewebsubmission.com 

Submit your site to web directories.