- xml-sitemaps.com - generate XML sitemap for your website. Nothing to install. Enter the URL and set some options.
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Alexa.com - see traffic rank and number of incoming links
- The Way Back Machine -- see how website looked in the past.
- Google Webmaster Tools
- Webmaster-toolkit.com
- DomainTools.com
- Accredited Registrar Directory
- TheFreeCountry - list of free webmaster resources
- DNSstuff.com - health check of your domain name
- QualifiedAddress.com - web service to validate and scrub user inputted addresses
- DimDim - collaborative online meetings and desktop shares
- Senduit - Transmit large files to each other
- Etherpad - Online collaborative document edit. Has a chat room as well.
- Rex Swain's HTTP Viewer - Enter URL and see the head and text content returned.
- ConceptShare - upload and share design spec for multiple user collaboration. CorelDrawConceptShare is a branded version of ConceptShare. They both have free trials.
- Infinovision - adds streaming video to your website.
- BackLinkWatch.com - checks the backlinks to your site.
- DownForEveryoneOrJustMe.com -- tells you whether a site is up or down
- Proxify.com - web based anonymous proxy service to let you surf the web via an intermediary proxy even if your firewall blocks a particular site.
Email Newsletter Services
- MailChimp.com - has free option, pay-as-you-go option, and monthly pricing plans
- ConstantContact.com
- iContact.com
Tools to Tests Whether Site contains MalWare
- McAfee SiteAdvisor - enter the domain name and it will tell you if a site is a phishing or spam site.
- StopBadWare.org Report Search - enter URL and is if it is listed in the bad website clearinghouse. Their request for review form in case your site was listed due to hack.
- Norton's SafeWeb
- UnmaskParasites.com - search page content for any malicious content
If you site has been hacked and got listed in any of the above, this article explains how to fix and this article explains what you can do to get removed from the listing.
You can report malicious site to Google here.
Besides Norton and McAfee, you can try ESET NOD32 anti-virus or the free AVG Anti-virus.