Akismet, and spam will be just a distant memory!
Essential to combat spam
Free for non-commercial use
Once activated you must not think about anything
A bit 'cumbersome installation
Premium for commercial use
Akismet is certainly one of the essentials of Wordpress. In the future, perhaps the same WP will be equipped with an anti-spam system worthy of note, but for the moment the most effective solution is a-kis-met. A slightly cumbersome installation serves as the feedback no longer have to worry about anything once you activate the plugin and almost zero configuration. Not to be missed!
Type: Free/ Premium
Current Version (look at review date): 3.1.2
Price: starting from 0 to 9 per month for single license
You can find it on: WordPress.org or Akismet.com
Can I Have it for Free?
Automattic makes available for its Plugin Akismet basically 3 plans, a completely free for blogs and ‘non-commercial’ websites, one at a price between 5$ and 9$ per month depending on whether you want to integrate the plugin even with a backup service (VaultPress) for ‘commercial’ sites and those who want more services such as those relating to safety and statistics and, lastly, a ‘VIP’ version which costs 50$ per month dedicated mostly to agencies, services hosting etc. and usable on unlimited sites / blogs.
Really I will not have to worry about anything once installed?
Exact! Once installed (and therefore once you have signed up to Akismet.com) there is practically no more work ‘maintenance’ or anything, you just have to set your preferences with respect to behavior that must be taken with Akismet spam and can also forget of unnecessary comments and irrelevant … until Akismet will be activated not more even receive one!