kr4ft3r

Multisite support added in v0.6!
Notice: this plugin will not have further major updates. If interested in new features, please upgrade into this compatible replacement: https://wit.rs/wp-plugins/wit-custom-output 
After uninstalling the WPCHTMLP and installing WIT Custom Output, your old custom pages will still work, but with better interface, more features and regular updates.
WP Custom HTML Pages plugin has two functionalities:
1 – Create a custom HTML document output at a custom permalink address, completely bypassing WordPress templating. This is useful in cases when you just want to output some HTML without uploading the page to the server.
2 – Create a shortcode which outputs your custom HTML.

WP Custom HTML Page

Display full custom HTML on custom permalink address, or put it inside content as a shortcode.

devoutpro

NoMore404 is a free WordPress plugin for redirection of 404 pages and simple firewall to block malicious hosts and URLs. 
All redirections are done via 301 redirection. 
You can mark any hosts and URLs to be blocked as malicious as well.

Nomore404 404 Redirection and Firewall

NoMore404 is a free WordPress plugin for redirection of 404 pages and simple firewall to block malicious hosts and URLs.

WP Custom HTML Page vs Nomore404 404 Redirection and Firewall