Net Toolbox features a tool to check if your favourite websites are online, a tool to check if your ports are open, a tool to find information about your wifi network (ip,ssid, signal strength, mac address, netmask, dns, link speed and gateway) a tool to ping other devices, a whois search tool and,for those with rooted devices and busybox, a traceroute tool.
App icon credit Adam Goebel.