Slick is messenger application for mobile phones. It allows you to chat with your friends connected though various online messaging applications.
Currently it is still in development, and alpha version is available for free for public testing
Skyfire is a free mobile web browser that allows you to experience the internet on your mobile phone exactly like on your PC. Now, you can use the full web from your mobile phone with unprecedented speed and simplicity without the typical restrictions and limitations that current 'mobile web' efforts offer. It's "The Web", not some mobile web
Twitli is a Twitter client for Android phones. Twitli is aimed at providing a maximum number of features while keeping the user interface easy to use. The number of buttons is limited: rather than putting "follow" and "direct message" buttons on the screen, Twitli gives access to these features by clicking a user name
aDialCode tells you how to dial to a city from another city. It runs on Android powered mobile phones with a minimum memory footprint. The intelligent quick-find technology enables you to pick a city from the built-in 1000+ cities list easily and quickly
Telnet client-a simple telnet application for Android. After starting telnetd on your G1, naturally the next thing you want to do is to telnet into it. Android did not have a telnet application, so I quickly whipped up a raw telnet client
Meebo for Android is a multi-protocol instant messenger client. It supports AIM, Yahoo!, MSN, Google Talk, ICQ and Jabber IM networks.
The Meebo client for Android runs in the background and displays new notifications in the system tray
Opera Mini is a well-known mobile Web browser. This is the first version of Opera browser that runs on Google's Android open mobile development platform.
The Opera Mini browser renders web pages that have been transcoded to the binary OBML format, meaning much smaller downloads and a faster browsing experience on mobiles, than would be provided by other browsers
Phonalyzr takes your Android handset's phone call log and displays a number of different graphs which can give you an interesting and never before seen look into your calling habits.
The graphs work on all data stored in the handset's call log history and no private details are ever stored or transmitted by the application