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Have you ever come across an app you really wanted, but the Market indicated it wasn't compatible with your device? Sometimes, that's not entirely true. The app may not be available due to a slight compatibility bug, but one you are willing to overlook, or due to a license agreement with a particular manufacturer, and so on.

CloudOn for example, is available for the Nexus 7 device, but not my Acer a110.
There is a free version of Namco's PacMan available for Sony devices, but not others.

With this program, you can get around those limitations. While it is a bit convoluted, if you really want those apps, this is the tool to help you get them. You install this app, tell it what device you want to emulate, sign back into the Google Market, download the app sign out and restore your original information. Problem solved.

This is a non-market app, that you will need to get from here

When you connect your Android to a PC, you get the choice to mount the SD card(s) or not. However, if you mount them to the computer, they are no longer accessible to the Android, until you once again disconnect. With this utility you can access them simultaneously on the device and PC! If nothing else, then this saves having to reload apps and icons. It's a must have for every experienced Android user.

This program will run in the status bar on your device, giving you quick access to force close any application open on the screen. It's very handy.

If you've Rooted your phone or reflashed it and aren't sure if Root access is still available, this utility is a fast way to check. It of course requires SuperUser and BusyBox in order to work.

If you're like me, you've downloaded, tried and uninstalled a lot of apps. That leaves a lot of junk files behind. Programs like this will help you find and hopefully delete and that are no longer needed.

Measure the read and write speeds of the SD card(s) in your Android device. This is very handy when used with SD-Booster. You can determine what difference each cache size adjustment makes.

The default cache for your device is too small to be effective. By increasing it to between 1MB and 2MB, you can see significant performance increases. My phone originally had a cache well under 100KB. By testing different cache sizes with this tool and SD Tools to measure read and write speeds, I was able to see a significant performance increase. My average SD card speed was between 6 and 8MB/s before using this tool, but now it hits as high as 11 and 12MB/s.

Like BusyBox, this application is required both to Root your phone, and after it has been Rooted. Other applications use it to gain administrative access to your device, which is necessary for some advanced applications like firewalls and advanced backup software.

If you have a high speed SD card, you can improve the performance of your Android device by adding a swap file to the card. The default size of 200MB works quite effectively.

This is the best backup software available for Android devices. It lets you backup, uninstall and reinstall every application on your device, including the system software that came with it. It also lets you make incremental backups. It requires Root access.