Touchbase - Contact Form Builder - Build beautiful contact forms, feedback forms, registration forms and surveys for your website.
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Web Form SPAM Protection - With this utility you can easily enrypt your html web forms and protect them against SPAM e-mails
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Google Forms - Simple web forms from Google.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.