NoSpamNX

This plugin uses hidden fields instead of sessions, CAPTCHAs, moderation or spam databases.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• Easy installation (just activate the plugin)
• Does not require any modification on your comment template
• Does not change any of your comment formfields (giving you more compatibility with other plugins and templates)
• Does not require JavaScript, Cookies or Sessions
• Does not require any extra field for user input (e.g. Captcha)
• No need to manage spambot comments anymore (if you don't want to)
• Compatible with comments-popup
• Compatible with WordPress MU
• False-positives are nearly impossible
• Protect Registration and Login Form against automated access
• German
• English
• French
• Italian
• Spanish
• Chinese
• Polish
• Swedish

What is new in this release:

• Added filter for comment delay.

What is new in version 5.1.8:

• Increased wait time for post from 5 to 10 seconds.

What is new in version 5.1.7:

• Added license tag.
• Updated translations.

What is new in version 5.1.6:

• Fixed bug in dashboard.

What is new in version 5.1.5:

• Fixed debug error.
• Fixed translation bug in dashboard.

What is new in version 5.1.2:

• Updated settings.
• Updated translations.

What is new in version 5.0.0:

• Added timestamp check for new comment
• Removed option to show blocked word from blacklist
• Blacklist can now block IP-Ranges based on CIDR (e.g. 10.43.8.67/28)
• Updated readme
• Updated Translations
• Updated Screenshots
• Updated FAQ

What is new in version 4.1.6:

• Added link to plugin settings.
• Added plugin banner.

What is new in version 4.1.3:

• Minor code improvements.

What is new in version 4.1.1:

• Added Hebrew Translation.
• Fixed Bug with WordPress >= 3.0.
• Minor Code Update.

What is new in version 4.1.0:

• Improved Spam-Protection.
• Update Italian translation.

What is new in version 4.0.5:

• Wrong Message was displayed when a comment was blocked.
• Global Blacklist is now sorted.
• Code cleanup.

What is new in version 4.0.3:

• Removed PHP Version Check.
• Removed Referer-Check.
• Removes static in uninstall_hook.

What is new in version 4.0.1:

• Updated Russian translation.

What is new in version 3.21:

• Minor Code cleanup.
• Some cleanup in Backend.
• Updated readme.

What is new in version 3.17:

• Removed Custom CSS Option (Fields are now hidden by display:none again).

What is new in version 3.15:

• Fixed Bug when activating plugin
• Removed deactivation hook
• Plugin now requires at least WordPress 2.8
• Updated language files

What is new in version 3.9:

• Fixed bug when displaying statistics.
• Removed function that could cause false positives.
• Updated Spanish translation.

What is new in version 3.5:

• Fixed Bug in plugin activation
• Added Italian Translation

What is new in version 2.9:

• Added Tags to hidden field for XHTML 1.0 Strict compatibility (Thanks to Pete Stephenson!)
• Updated Spanish Translation

Requirements:

• WordPress 3 or higher