Make your website to maintenance mode

Sometimes, You need to make changes to your website’s design, WordPress theme or content. This would make your website temporarily unavailable to public access. In this case you will probably need make your website look and feel more professional.

There are many free plugins on WordPress.org that let you put your website into maintenance mode and display a custom message to your visitors. For example: WP Maintenance Mode (by Designmodo). WP Maintenance Mode allows you to have full access of your website during the maintenance mode.

Plugin WP Maintenance Mode:
https://wordpress.org/support/plugin/wp-maintenance-mode

Xenu’s Link Sleuth – Find broken links on your site

Xenu’s Link Sleuth (TM) checks Web sites for broken links. Link verification is done on “normal” links, images, frames, plug-ins, backgrounds, local image maps, style sheets, scripts and java applets. It displays a continously updated list of URLs which you can sort by different criteria. A report can be produced at any time.
Additional features:

Simple, no-frills user-interface
Can re-check broken links (useful for temporary network errors)
Simple report format, can also be e-mailed
Executable file smaller than 1MB
Supports SSL websites (“https:// “)
Partial testing of ftp, gopher and mail URLs
Detects and reports redirected URLs
Site Map

Download:
http://home.snafu.de/tilman/xenulink.html

Screaming Frog SEO Spider

The Screaming Frog SEO Spider is a website crawler, that allows you to crawl websites’ URLs and fetch key onsite elements to analyse onsite SEO.

The SEO Spider is powerful, flexible and able to crawl both small and very large websites efficiently, allowing you to analyse the results in real-time. It gathers key onsite data to allow SEOs to make informed decisions. Some of the common uses include:
Find Broken Links.
Audit Redirects.
Analyse Page Titles & Meta Data.
Discover Duplicate Content.
Extract Data with XPath.
Review Robots & Directives.
Generate XML Sitemaps.
Integrate with Google Analytics.

Screaming Frog SEO Spider:
https://www.screamingfrog.co.uk/seo-spider
(Download for free, or purchase a licence for additional advanced features)