Mailwasher - Over 8 million people use MailWasher as their spam filter
Skuuudle - Discover, match and monitor your eCommerce competitors.
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird
Price2Spy - Price2Spy is a price monitoring, pricing analytics, and repricing tool, meant to help eCommerce professionals keep an eye on their competitors or retailers.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
BuiltWith - Find out the technology behind websites