Some built-in applications are limited to only a few features which could be improved. That’s why this kind of applications appear. To make an almost prefect application perfect.
Name:
VirtualKey
Features:

You can configure any button to do whatever you want it to do and launch any application (I’ve been dreaming for this function)
For example if you don’t use [...]

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Viigo:

It used to cost $30 (named Newsclip) but now it’s for free.
You can add and remove RSS links from your BlackBerry homescreen.
It can remember up to 1000 RSS feeds (250 by defaul so you’ll have to change the settings)
You can manage your feeds here too

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newsGAtor:

It’s not only available for BlackBerry. [...]

In case you didn’t know: The alarm of your Symbian phone wakes up the phone if it’s switched off, so I looked for an application that can automatically switch off my phone so I don’t have to worry about doing it manually.
And here it is. A simple application that switches your phone off.
Name:
Switch Off

Features:

It is [...]

Name:
Gdesk

Features:

Totally lets you customize the interface of your phone. Especially if you have a Symbian enabled devices and you don’t like the looks anymore.
There are available themes for UIQ, but you can totally customize your themes.
You can add/remove applications and move them around the desktop like on a home computer.
Be careful cause it still isn’t [...]

An easy to use application for Windows Mobile(5, 6, 6.1) enabled smart-phones that will satisfy your needs without too many extra or useless functions.
Name:
GPS2Clipboard

Features:

Ability to track your own waypoints and export those in a few different formats.
Sexagesimal, decimal, and fractional formats.
Also supports Google maps format, so you can just send a link to someone and [...]

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Sync Entourage Contacts, Calendar, Tasks, E-Mail & Notes.
You can sync Mail.app email with your BlackBerry device.
You can sync iCal Calendar and Tasks with your BlackBerry device.
Install 3rd party applications from your Mac to your BlackBerry.

Where to learn more:
pocketmac.net

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Block and reject those unwanted calls.
Block unknown numbers, private numbers, contacts from the address book or even any number calling.
StopCall will work in the background and will do all the call blocking.
It’s Free.

Where to learn more:
mobiletopsoft.com

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Features:

Name your device and give it a personal mymobilesite.net address.
Install Mobile Web Server to your Nokia S60 device.
Access your mobile device using a PC and a web browser.
Host a blog in your phone to exchange views and experiences.
Share your images and calendar with friends.

Where to learn more:
mymobilesite.com
Screenshots
Register
Download

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Fast, easy, reliable way to update and maintain your website via FTP or simply upload / download files to and from public or own FTP servers.
The application is very simple to use but very powerful and besides the FTP functionality application also features the powerful file manager.
You can switch between the local and the remote [...]

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Map Drives
Features:

A Virtual Drive is a shortcut to any folder that may be located deep in the file system mapped to a drive letter, just like in Windows.
You can also see these drives via Nokia PC browser on your computer when connected via USB

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Map Drives

Creates a Virtual drive
After installation, in your E drive, [...]