Some Wordpress plugins are often updated, which is good think. Plugins that are updated are 100% compatible with last Wordpress version and they also are the most secure possible. A plugin that has not been updated for a long time might not work with last Wordpress version and might create a security breach for you website.
This plugin adds Google's No Captcha reCaptcha to WordPress comment, login, registration and lost password forms.
OSD MailChimp Forms allows you to add as many MailChimp subscription forms to your pages as needed.
If you want FACEBOOK like functionality for your buddypress installation where Homepage for Vistiors is different than Logged in users, you should try …
This is simple plugin which forces the users to write POST title in Add New Post page.
Allows to decide buddypress website admins where their users should land after log in.