My applications for Android:

Check My Server
A lightweight and powerful tool for monitoring servers up-time and response status.
Join early access - beta program.

Earthquakes Tracker
Earthquakes tracker, alert and information at your fingertips. ( Web page will be available soon!)
Also, Earthquakes Tracker Web App is available on

RR's Unit Converter
Powerful unit converter and calculator for android smart phones. Simple and user defined compound units. As a bonus, this program contains definitions for almost all units within the database. Visit RRs Unit Converter page for more details.

IP Info Detective
Want to know the status of an IP address? Let IP info Detective investigate it for you. Visit IP Info Detective page for more details.