Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Web ScrapBook - A browser extension that captures the web page faithfully with highly customizable configurations.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Archivarix Website Downloader - Website online downloader and Content Management System (CMS) existing site converter.