The HTC Desire HD phone is a particular nice Android smartphone, but the HTC Sense interface has some flaws.
Here is my list of top 5 free apps I have installed on my HTC Desire HD to replace stock apps or fix unwanted behaviour of HTC Sense.
1. Call Confirm
How many times have you accidently touched a contact in your caller list or touched the phone button which instantly called the last dialed number? Wouldn't you rather have to tap the screen once more per call to confirm instead of harassing your friends or business contacts with unwanted calls? Then this simple and free app is for you. It instantly pops up a small confirmation dialogue including the picture of the called person. Tap once more to call! Easy as that, free and I wouldn't want to live without it anymore.
2. Easy ReminderThe LED on the Desire HD is a sad little thing.. quite frankly it's worse than useless the default way it is configured. For one, it is hidden beneath the speakers and you can only see if it's blinking, if you look at your phone from a very straight angle. If it's lying on your desk and you are walking by, you will probably not see it. It's also set to blink very shortly and then go off for a second or so.
But what's even worse is the fact, that the LED will stop blinking after a couple of minutes. This of course renders the LED completly useless, because if the notification is not showing every missed call until you dismiss it, you have to unlock your screen and check manually for missed calls every time you have left your phone unattended for more then five minutes or pull it out of your bag in a loud environment.
A good solution is to install a little free app called Easy Reminder, which will allow you to set the notification to blink forever - until you unlock your screen or read the sms.
3. Battery Indicator
Unlike the Iphone's interface, the stock battery indicator in the menu bar will only show a graph of your battery status, not a percentage number. Use the free Battery Indicator app to show the percentage where you can always see it, in the menu bar or as a nice small widget on your home screen.
4. Business Calendar
If the stock calendar on your HTC phone will not satisfy your daily needs (which it will not, if you use the calendar for anything more than displaying your Facebook friend's birthdays) - Business Calendar is for you. I have tested more than a dozen free and paid calendar apps from the market.
This is the most powerful, stable, usable and configurable calendar I have found. Plus it's interface is pretty too. There is also a paid version around $3.99, but the free version has almost all features of the full version and it only shows a small, unobtrusive advertisement. Check it out!
5. 3G Watchdog
Super nice app icon and user interface, some beautiful widgets and simply the best way to keep track of your mobile data usage. End of story.
Extra: Tasker (not free)Not very intuitive interface (to say the least), highly overcomplicated to program (even for skilled programmer's and long time computer geeks) - but if you have got it working, it will fulfill almost all of your geeky needs to make your Android smartphone even better.
I for one use it amongst many other things to fix those stupid volume keys on the side of the HTC Desire HD, which I keep hitting unwanted all the time, especially it I turn the phone sideways for using it widescreen.
One short notice on Task Killer apps:...don't use them :) The Android operation system is optimized to keep frequently accessed apps or those that need to be running services in the background in memory. Killing these tasks and removing them from memory will not make your phone faster or more battery efficient in the long run. Usually these services will be restarted automatically in the background after a couple of minutes, which will drawn your battery even more.
If you really don't want that app to be kept active in the background or you rarely use it, wipe it of your phone entirely instead.
Have fun using your Android smartphone!