Description
“Block Spam Comment” definitely blocks comments of bots without settings or Captcha.
The three systems of “Block Spam Comment” using JavaScript make it impossible for bots to post comments, because bots cannot use JavaScript. Spam comments are not saved, so it reduces load on your server and save time to delete spam comments.
You can see how many spam comments were blocked and data about IP and user agent of bots. You also can download the csv file with that data.
Screenshots
Plugin page 
ERROR page
Installation
Install and activate the plugin through the ‘Plugins’ menu in WordPress.
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Contributors & Developers
“Block Spam Comment” is open source software. The following people have contributed to this plugin.
Contributors
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Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.1.0
Improvement in some functions.
1.0.3
Improvement in function.
1.0.2
Bug fixed.
1.0.0
First release.