Konstantin Kovshenin

Seriously, this plugin doesn’t do anything else. It just prevents WordPress from registering its default widgets.

Remove Default Widgets

Removes the default WordPress widgets. Period.

Josh Hartman

Command your admin dashboard. Manage built-in widgets (Right Now, Recent Comments, etc.) and dynamically registered widgets (Google Analytics Summary, WP E-Commerce Dashboard, etc.). Hide widgets depending upon user capabilities.
This plugin is based upon Dave Kinkead’s Dashboard Heaven plugin and extends it to support dynamically registered widgets, such as dashboard widgets that are added by a plugin.
After installation access to all dashboard widgets is removed, then you can use the options at Settings > Dashboard Commander to configure the minimum access level for each widget.
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Dashboard Commander

Command your admin dashboard. Manage built-in widgets and dynamically registered widgets. Hide widgets depending upon user capabilities.

Remove Default Widgets vs Dashboard Commander