| Broadband Tests and Tools | Speed tests, port scan, etc. Some tools require registration. |
| Can I use | Provides a list of browser versions that support HTML, CSS and other features. |
| FAST.com | Speed test |
| Favicon | Review of 15 Favicon generators. |
| Favicon checker | Website for checking favorite icons for Apple iOS Safari, Android Chrome and desktop browsers. |
| GeoPeeker | See how a site appears to the rest of the world |
| Google Search Console Tools | Google Webmaster tools reports crawl errors, and provides crawling and indexing information. |
| HTTP Viewer | Shows HTTP communication protocol details including header, cookies, if set, URL forwarding, etc. |
| HTTPS Header Check | Reports HTTP headers that the web server returns when a URL is requested. |
| Mobiletest.me | Smartphone and tablet emulators for testing websites. |
| Mozilla Observatory | Scans HTTP headers, TLS and SSH configuration, security settings and gives recommendations. |
| Network Security checks | Scan ports commonly used by trojans and viruses. |
| SMTP Diagnostics | Email server SMTP Diagnostics. |
| ShieldsUP! | Internet security profiling that checks vulnerability of file sharing and service ports. |
| Speedtest | Internet connection download upload speed test. |
| Virustotal | Online free service that analyzes files for viruses, worms, trojans, and other malware. |
| Where's It Up | Check your site's HTTP status, DNS & Routing around the world |
| rot13 Encoder Decoder | Caesar-cypher encryption that replaces each English letter with the one 13 places forward or back along the alphabet. |
