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.
A simple plugin displays a math question in the form of text while writing a comment
Browser Resize Images
An extension of the menu system with context-based rules and a flexible framework to write your own.
"Facebook Page Publish" publishes your blog posts to your Facebook profile or page. New fork updated for latest wordpress and facebook.
Good Old Gallery helps you use galleries on multiple pages and posts, it also uses jQuery plugins for sliding and fading transitions.
Simple and lightweight widget for displaying weather data and forecast from Weather Underground (www.wunderground.com).
TCW lets your users know how much traffic you have on your blog. It counts pages visited, hits and unique IPs on your blog and shows it in a widget.
Adds a [mailchimp_campaigns] shortcode that lists your latest MailChimp email campaigns
Photo Albums for BuddyPress. Includes Posts to Activity Stream, Member Comments, and Gallery Privacy Controls.
Add Social Networks Share Button at Home, Category and Single Posts Pages.