The one people use most (which is like Viber is Whatsapp.
Software I have that I have which is useful (Galaxy SII V2.3.2):
CamScanner - Turns your camera into a scanner. Can take multiple images at ones and it basically rotates the image flat as possible and does some enhacements. Then the imags can be PDFed into one document. very handy.
Cricket Live - well it is circket season haha.
NBA Game Time - well it is NBA season haha.
VLC SDR Lite - Turns your hpone into a remote control for VLC player (requires some setting up on PC end, but easy to do as there are instructions on devs site).
Speaking Phone Free - Basically speaks when someone is calling and reads your smses for you in a YANK female voice (didn't check if can change).
ANZ goMoney - Who needs internet banking now haha.
AndroSensor - gives are few interesting readouts, liek light level, magnefic field etc..
HDR Camera+ - fo rphoto takling (hardly use it). It takes multiple phots and domes some magic to apprently make them look better. I am sure some camera person on her coudl explain it.
Go Launcher EX - jsut another desktop GUI for android as the samsung galaxy S TwLauncher can get corrupted, so I switch launchers to be able to navigate my phone to clear cache of TWLauncher to fix the issue.
BlueZ IME Settings - A bluetooth program that allows me to setup my phonejoy gamepad (
http://www.phonejoy.us). It works with games that support blue tooth controllers.
Nesoid, SNESoid etc.. emulators (
http://slideme.org/user/yongzh) - these are the most compatible to the original hardware. Not avaialble on market direct as google removed them.
TeslaLED - different lgiht effects. BUt I got it cause it was called TESLA. bloody electrical engineers.
AndChat - IRC client.
ShamZam - listens to music and tells you what it is (MUST HAVE)
ES File Explorer - A better file borwser that default.
MELBOURNE APPS = Train Trapper, Tram Hunter and Melbourne Alarm - Help you get aroudn trains and trams. Melbroune Alarm vibrates your phoen when reaching close to destination(it uses GPS to kwon where you are)
NICE HARDWARE to have for android phone is a HDMI MHL adapter:
http://www.ozcardtrader.com.au/community/threads/samsung-galaxy-to-tv.122937/
I will let the link do the talking and selling.