AndChat (Free) [The best IRC client]
ASTRO File Manager [The best file manager]
Camera360 UltimateEndomondo Sports Tracker [To track the distance or route you travel]
Dropbox [The best cross platform file sharing app]
FxCameraGoogle Goggles [Best app to read those QR codes and search with images]
Hindu Calendar [Useful sometimes, when mom needs to know dates of some festival

]
iMobile [App from ICICI customers, very useful to me, I do prepaid recharge from this]
Indian Railway App – Disha [PNR check, availability checker, train schedule and more]
Opera Mobile web browserSMS Backup + [Best app to take Backup of your SMS’s on your Google Account]
WhatsApp Messenger [Universal Bluetooth, as I like to call it Send sms, share pics etc…]
Remember The Milk [Cloud Mobile Task Management]
Pulse News* [Best news aggregator app]
Quick Boot* [Lets you reboot or shutdown, without using actual power button. For those, who fears they would break hardware button. Like me.]
Photo Resizer* [Does what it says]
Astrid [Homage to this little To Do and Reminder app that was at pinnacle of its service, until it decided to shut down on 5th of August 2013. I will miss you.]