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.
Add a ManageWP.org sharing button to the Jetpack Sharing module
Creates a custom post type to display info about members of your group or organization.
Use shortlinks instead of permalinks in Jetpack sharing buttons
Quick edit "There are no shipping methods available ..." WooCommerce message
Extends the Jetpack plugin and allows you to add sharing buttons anywhere inside your posts thanks to the [jpshare] shortcode
Adds Featured Images before the content, in the Jetpack Mobile theme
Adds ads before or after your posts and pages, in Jetpack's Mobile theme