Must have android apps?

[SHWAIT]

[joe.attaboy]

Titanium Backup
Handcent SMS
Yahoo Sportacular
Ringdroid
GPS Status

[Kent]

Quickpic, tubemate, zedge, history eraser, mx player, go sms pro

[Mroweh Mroweh]

google play

[Saravanan]

opera mini opera mobile
angry birds
es file explorer
hill climb racing
mx video player
updated Google maps
raging thunder

[Stu]

my most used apps outside of the google suite of apps (gmail, maps, contacts,Google plus)
Groupme (awesome cross platform group messaging app)
facebook (its actually nice now that its been updated)
instagram
twitter
thechive
tapatalk (awesome for navigating through your favorite forums)
Astro File manager
MX player (plays any video i have thrown at it)
Titanium backup/root explorer (for rooted devices only)
Beweather
youtube
play music (20,000 songs stored in the cloud and streamed to my device for free...amazing)
pandora
tunein radio
ultimate custom clock widget (create your own widgets basically, time,date,weather, notifications ect.)
home screen launchers. if you are on android 4.0 and above, i would suggest nova launcher. for anything before 4.0, i would suggest ADW or Go launcher. it gives you lots of options to change the look and feel of your device and gives the home screens a speed boost at the same time.