Online Tools
Google Admin Toolbox (DIG/BrowserInfo/Har Analyzer/Check MX/ Encode-Decode / MessageHeader and more
Find if 2 IPs are on the same subnet
NetLog Viewer (chrome net-export viewer)
Web version of Hans Brender's OneDrive Bot
Get Browser client info (like IP, Browser, Location, country and so on)
Detect your browser's language
SharePoint/OneDrive Shared Link Decoder Tool
RDAP Lookup Tool - a tool for Registration Data Access Protocol (the new WHOIS)
Online Games