The Basic Antispam Plugin provides basic antispam features like: allow anonymous comments, detect feedback duplicates, feedback sensitivity to links, apply rel="nofollow", block spam referers, check referers for URL and check trackbacks for our URL.
Category: "Antispam Plugins"
For b2evolution v5.
This plugin allows you to use the GeoIP database from MaxMind to determine in which country users are located in.
This plugin allows you to add CAPTCHAs to your site in the form of simple questions requiring simple text answers.
For example the site would ask "What animal is Bugs Bunny?" and the user would need to type in "rabbit" or "a rabbit".