moz.com/researchtools/ose
By this tool you can research backlinks, find link-building opportunities and discover potentially damaging links.
majestic.com
The Majestic tool helps you analyse your competitors link and help you find the right website that can help you increase your loyal audience.
LINK: https://majestic.com/
intodns.com
IntoDNS checks the health and configuration and provides DNS report and mail servers report.
LINK: https://intodns.com/
hypestat.com
HypeStat is a free statistics and analytics service where you can find information about every website.
LINK: http://www.hypestat.com/
dedicatedornot.com
This tool determining the type of hosting a site resides on. You can search by domain or ip address and find out if the hosting is dedicated or shared.
domainbigdata.com
By this online investigation tool you can find registrant and other domains owned by the same person, network details (domain history, domains on same IP, IP Network owner and more).
wappalyzer.com
Wappalyzer is a cross-platform utility that uncovers the technologies used on websites. It detects content management systems, ecommerce platforms and more.
LINK: https://wappalyzer.com/
builtwith.com
Web technology information profiler tool. You can find out what a website is built with.
LINK: https://builtwith.com/
count.ly
An open source web and mobile analytics tool that supplies information about onsite and in-app behavior. Also push notifications and crash reports, user profiles, attribution tracking for traffic sources and campaign tracking.
LINK: https://count.ly/
w3counter.com
Free web statistic tool. Add W3Counter to your site and learn all about your website visitors — where they come from, how they use your site and which pages they love.