Easy to use tools to perfom simple tests from a server based in Switzerland
www.ip-plus.net

Netcraft provide monthly Internet research reports on the hosting industry and specialise in phishing detection and countermeasures
www.netcraft.com

Free online network utilities, including traceroute, nslookup, dig, automatic whois lookup, ping, finger, and our own Domain Dossier and Email Dossier. Some source code included.
centralops.net

Whois lookup dialog
www.samspade.org

Test your Internet connection bandwidth to locations around the world with this interactive broadband speed test (requires Adobe Flash®)
www.speedtest.net

Compare Australian Broadband internet providers. Your guide to ADSL, ADSL2+, Mobile Broadband, Naked DSL, Cable, Satellite & Wireless Broadband plans from major Australian ISP's. Compare broadband deal from Telstra Bigpond, Optus, iiNet, AAPT, Primus, DODO, Netspace and more.
broadbandguide.com.au