New plugins
Delete Custom Fields will let you delete every instance of a custom field from your site.
OfferMatch shows offers or ads related to your posts.
SimpleTest for WordPress is a tool for WordPress plugin developers who want to create and run automated tests for their plugins.
Toppa Plugin Libraries for WordPress includes several utilities for plugin developers. They facilitate the use of Agile coding techniques for developing WordPress plugins.
Updated plugins
WordPress Beta Tester allows you to easily upgrade to WordPress Beta releases.
SimpleTest for WordPress is very much useful developers like me. Superb one for testing. Delete Custom Fields also sounds great.