Nikki Blight

QR Redirector lets you set up your own QR Code redirection site. The plugin creates a new custom post type called QR Redirect, which generates a QR code that points to the post’s permalink. You may then specify any URL you like for the post to redirect to. Useful if you have an offsite contest, form, newsletter sign-up, etc. You can even change the URL you’re redirecting to without having to worry about updating the QR code in your advertising media.
This allows you to continuously reuse your QR codes on printed or linked marketing material… you can change the destination you’re sending your users to without ever having to change the artwork you’re using to promote it.
This plugin uses the Endroid QR-Code PHP library.

QR Redirector

QR Redirector lets you create a QR code for a URL on your site, and redirect that URL anywhere.  The result is a reusable QR Code.

danielbolander

This WordPress Plugin fixes 404 Errors in Google Webmasters by Redirecting all 404 URLs to Home Page or a Custom URL.

Redirect 404 to Home Page – Custom URL

Great Plugin

This Wordpress Plugin fixes 404 Errors in Google Webmasters by Redirecting all 404 URLs to Home Page or a Custom URL.

QR Redirector vs Redirect 404 to Home Page – Custom URL