These are all Android apps I heartily use and recommend for my AT&T Galaxy S phone.
Find all these apps on Google Play for your Android phone.
RealCalc Scientific Calculator – a great calculator. The stock calculator suuuuucks but RealCalc is great (and costs like a buck or something!)
NoLED – It turns on the screen and tells you when you’ve missed a call or text. Essential (I can’t believe Samsung forgot this functionality!)
Google Goggles – great for scanning QR codes (those fancy new computer bar codes). It holds promise for doing a lot more, but not much more yet.
Fish Bowl – photo gallery
Clock – The built in Clock app with the wake-me-ever-so-gently “Smart Alarm” is my daily alarm clock and I love it.
Lord Of Magic – fun shoot’em up
Gmail – of course
Google Maps – of course
Silent Time – Works great to keep my phone quiet for my weekly appointments.
SwiFTP FTP Server – I use this and an FTP client on my home computer to move files from my computer to my phone
Hi-Q MP3 Recorder – Rock solid
I use this every day to record lectures and people giving me information. It is indispensable.
Chase Mobile – it’s pretty convenient depositing checks remotely!
Google Voice – works great. Once every couple months it doesn’t let me listen to voicemails but generally works great.
Andmade Share – makes sending attachments and such way easier
Astro Player – Music playback. Love it for the equalizer and playback speed adjuster. I record lectures in school. I use the equalizer to make the recordings listenable and I use the playback speed changer to scroll through the lectures quickly. Win!
BART Usher – It’s my go-to schedule travelling through BART
Data Traffic Monitor– Helped me diagnose a bandwidth hog program
Screen Filter – Indispensable brightness control for my AT&T Galaxy S phone.
Tasker – It is supposed to be super-duper powerful but the best use I found was that I created 6 (pretty useful) buttons with it that have obvious purposes: Sound On/Off, Wifi On/Off, 3G On/Off.
Wifi Manager – Lets me see the wifi networks around me at a glance. Nice.
Here are the maybe/maybe-nots
Groupme – I WANT to love it but 2 of my friends don’t receive the messages reliably :-(
SomaFM Radio Player – I WANT to love it but It uses a bit (30kb/min… 43 megabytes/day) of bandwidth and a lot of battery even when paused. I don’t have unlimited monthly 3G bandwidth so I’m wary to use the app.
Prey – It is supposed to track my phone in case I lose it. So far I haven’t gotten it to work right. But I’m on it.