Widgetable allows you to specify exactly which custom widgets you want on a per page/post basis.
Meta box on the post and pages edit page.
Widgets are custom post type and use standard WordPress functionality
Add shortcodes to your widget content area for even more widget options. Here we grab certain testimonials based on type.
Widgets displayed on the frontend. Including a MailChimp newsletter form.
Add the custom widgets by adding the Widgetable Widget to your sidebar