Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
Multiping - Get MultiPing Support. Network monitoring in 60 seconds. MultiPing provides a graphical view of network performance, monitors hundreds of targets, and sends automatic alerts..
GetJar - Discover and play paid apps and games for free.
SmokePing - Smokeping is a tool for measuring latency.
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.