Cron - Cron Calendar.
My Data Manager - Description Take control of your mobile data and save money on your mobile phone bill!
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
NetCounter - NetCounter is a simple network traffic counter for EDGE/3G and Wi-Fi. It shows your data usage.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Call Meter 3G - Call Meter 3G is an app that acts as a monitoring tool for all your calls, messages, and internet data.