looking for free wp plugin alternatives to these

three paid WP plugins:

Ubermenu (change menu buttons, structure and styles etc.)
https://codecanyon.net/item/ubermenu-wordpress-mega-menu-plugin/154703

Styles with shortcodes (adds lots of new functions such as galary, horizontal/vertical sliding tabs, social buttons, tooltips on hover etc.)
https://codecanyon.net/item/styles-with-shortcodes-for-wordpress/142221

Custom Widget Areas for WordPress (create unlimited number of Sidebars and be able to have each page, post have its own sidebar/widget
https://codecanyon.net/item/custom-widget-areas-for-wordpress/130941

Any recommendations would be appreciated!

Thansk!