I have given some links. Please search market.android.com and find the application using the keyword. Loginto Google with the same account as used on phone and you can install directly
* My phone is rooted so I can run all these apps. Many need root (*). If you don't know what rooted mean skip the entries with * in them !
PIM:
- Business Calendar (Better than stock and has a nice widget)
- CalWidget (With stock calendar. Good widget)
- SMSBackup (Backups all SMS to google with a tag)
Launchers:
- LauncherPro (Too heavy now but had paid :( !)
- Zeam (Really small and works)
Though using the stock launcher now !
- Tweetdeck
- Tweetdark (Black themed version of Tweetdeck)
- G+ (As tweetdeck still does not support this)
- If I had space would have used (FB/Twitter/Foursquare)
- Blogger (Haven't yet posting anything using it due to bad keyboard)
News:
- NewsRob with Google Reader Account
- Greader
- Google Reader
- QuickPic (as the pics come fast though for picasa I have to use the Gallery)
- Color Flashlight (Love the cop light and siren) https://market.android.com/details?id=com.socialnmobile.flashlight
- QQPlayer (Supports a lot of formats)
Books:
- FBReader (support all non DRM books). Lot of free ebooks are there to read
- Google Books (only works in US)
- *App2Sd https://market.android.com/details?id=com.a0soft.gphone.app2sd
- *SetCPU (If you are on xda-dev then you can get it free ;) )
- *Quick Reboot
- *Chainfire3D https://market.android.com/details?id=eu.chainfire.cf3d&feature=order_history
- AndExplorer (Used by the TypeFresh font changer. I use Ubuntu font now) https://market.android.com/details?id=lysesoft.andexplorer&feature=order_history
- SpareParts for faster animation and other settings
- Battery Indicator (As the stock android I have does not show % properly !)
- *Battery Calibration (Charge to full and click this. Will reset the battery. Then proper reading are shown for battery)
- *AdFree (No ads please)
VOIP:
- Google Voice (Got the account somehow and now use it for SMS to US)
- Skype (Works well though really resource hungry)
- Viber (Works pretty well though resource hungry)
- Linphone Video (Works really well with by Spokn account)
My Own:
- FalakCallerID (Shows a popup with the location and operator in India Only.)