Ederson Peka

With this plugin, you can create as much “sidebars” (widget areas) as you need, and assign them in a per-page basis. (It’s only useful if your theme supports “sidebars”.)
WARNING: Updating from versions prior to 0.2.5 requires new set up.

Unlimited Page Sidebars

This plugin does exactly what it needs to and always works. It's great.

Does exactly what it needs to!

Assign one specific widget area (sidebar) to each page.

Pankaj Anupam

Shortcodes in Sidebar plugin allow shortcodes to execute when used in sidebar text widgets. All that is needed is to download, install and activate. This is very useful for placing things like contact forms and other shortcode enabled features in sidebars.

Shortcodes in Sidebar

Upload, Activate - refresh page and shortcode is running, it worked right away. Thanks for that. 

Sweet

Shortcodes in Sidebar allows shortcodes to execute in sidebars.

Unlimited Page Sidebars vs Shortcodes in Sidebar