NovoTalk

a free Google Chat client

Features:
Text messages
Avatars
Finger Touch/Scroll Friend List
Marquee for long status messages
New email notification
Tab based Chatting
Notification on new Message (sound + vibrate)
Detect Invisible Users
Friend list sorted just like Windows client (Gtalk) on basis of availabilty and name.
Cool GUI

Notes
NovoTalk is written in C#, so .Net CF 3.5 will be required.
Might not work properly on smartphones.
Tested by on WM 5,6,6.1 and on HTC Touch with WM 6.5

NovoTalk

Talkonaut

Talkonaut™ is free mobile calling, VoIP enabled, Google Talk™ like application for your mobile phone. Talkonaut is available for three different mobile platforms: Symbian S60, Windows Mobile 5/6 and J2ME with MIDP-2.0.

Talkonaut™ supports Jabber, Google Talk, ICQ, MSN, AIM and Yahoo networks both for chatting and voice calling.
Talkonaut™ allows to make free VoIP over GPRS/EDGE calls, as well as calls over 3G, or WIFI.

Talkonaut

Yahoo! Mobile

i'm guessing lots of people are waiting for this.

GET NOTIFIED when Yahoo! Mobile launches

ICQ

ICQ for Windows Mobile brings all of the best features of ICQ on your PC to your Windows Mobile device!

ICQ for Windows Mobile lets you communicate whenever you want, wherever you are, in whatever way suits you best. Update your ICQ status and information when you're on the go. Change your conversation style, manage your Contact List, and much more. ICQ for Windows Mobile has many of the same key features and the familiar look-and-feel of the desktop ICQ client.

ICQ

QIP

ICQ and Jabber IM application for your PDA and Smartphone.

Features:
- Finger scrolling list of contacts;
- Open the windows of communications with the horizontal hold your finger in your contacts list;
- Quick selection Smile in the window message (optional);
- Floating height editor message (optional);
- Adjust the font editor communications;
- Sent to Enter (optional);
- Support for multiple accounts online;
- X-statuses;
- Search ICQ protocol;
- Save the stories (optional);
- More button to send (optional);
- The closure of the dialogue with the contact by double-clicking on the tab;
- Scrolling bookmarks in the Messaging window, Preferences and Details finger;
- Enable / disable the icon in the tray;
- Ability to disable the melody for a specific event (for example, receive messages), but leave vibrosignalizatsiyu;
- Hide pop-up messages if QIP assets (optional);
- Dzhabber connection to the server via SSL (optional);
- The possibility to include the regime "does not give your sleep"
- Ability to remove all icons in the contacts list, except for status;
- The opportunity to open the menu change the status by pressing the appropriate numbers on the keyboard;
- Full-screen mode (optional);
- Confirmation of the delivery of messages;
- Pop-up message display device from sleep (optional);
- LED indication of unread messages (optional)

QIP

YMTiny

Free J2ME Yahoo! Messenger

YMTiny is a free J2ME Yahoo! Messenger which directly connects to the Yahoo’s server. Just connect with your Yahoo! ID, no other registration needed.

It should work on all CLDC 1.0 and MIDP 2.0 devices.

Features

Settable message alerts: sound (midi), vibrate, flash backlight, open IM window
Bitmap fonts for consistent GUI
“Smart Ping” maintains connection and minimizes bandwidth usage
Receives offline messages, new mail and typing notifications
Set status and custom status
View a friend’s status, show and hide offline friends
Send and receive BUZZ!!!
Run in background and auto-restore
Window and scroll animations
Stylus support
54+2 Emoticons!
Data counter
Limitations

Does not support HTTP/WAP connection yet
Minimize function only works on some devices
Bitmap fonts could be invisible on some devices. Requires devices that support transparancy drawing.
Emoticons only works on bitmap fonts. Goto the Settings to change font.
Data counter may be inaccurated (less than actual usage)
Next features

Sends typing notifications (settable)
More sounds
Message archive
Conference
Skins

YMTiny

Nimbuzz

Nimbuzz is a FREE all-in-one solution for Internet-enabled mobile phones that allows you to take your IM buddies with you -- wherever you go.

Nimbuzz on your mobile promises you:

* Free Chat, Group Chat and Chatrooms
* Free Mobile VoIP calling (coming soon!)
* Free File, Photo and Ringtone sharing
* Free Voice Messaging
* Free Text Messaging (within Nimbuzz)
* Free Phonebook Backup and Restore
* Free "Buzz" notifications (to get your buddies online!)
* Local-cost Mobile Calling worldwide
* No phone credits to purchase
* No credit cards required

Nimbuzz

OctroTalk

Mobile Instant Messaging with full voice integration.This always-on product keeps you connected with your buddies, and your buddies reach you whenever, wherever. Works seamlessly over GPRS/EDGE/CDMA/Wifi/Bluetooth data connections, and cuts down your phone bills. OctroTalk now supports GoogleTalk/Jabber, MSN, AIM, ICQ and Yahoo.

Features:

* Always on connected to Google Talk/Jabber with MSN, AIM, ICQ and Yahoo transports
* Complete VOIP product. Access to PSTN.
* Supports Low Bandwidth Codec (even works with EDGE/GPRS/CDMA).
* Streamlined UI. Optimized for one-handed operation. Today Screen on Pocket PC. Home Screen support for Smartphone.
* Extremely fast P2P file transfer. Quick picture messaging.
* Low CPU usage. Only VOIP product that works on Treo 700w (300 MHz processor).
* Secure and Encrypted connection to GoogleTalk. Google Talk messages are encrypted using industry standard TLS/SSL.
* Message Archiving in your GMail Account.
* Share files with your buddies (automated file transfer).
* Access your computer remotely. Install OctroTalk for Windows on your desktop, and share a folder with OctroTalk on your Mobile.
* Support for GroupChat/Conferencing. OctroTalk lets you create/join Jabber conference rooms.

Octro

Slick

Slick is messenger application for mobile devices.

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.

Lonely Cat Games

fcGoogleTalk

fcGoogleTalk is a Google talk client for your

fcGoogleTalk is a Google talk client for your Windows Smartphone Device. You can connect to Google Talk and chat with contacts that are availible. Currently fcGoogleTalk can only run on Windows Mobile 5.0 SmartPhone devices. Just copy the cab file below to your smartphone or browse to the cab file to install.

Flow Choice

Fring

fring™, a free mobile VoIP software, allows you to talk & IM via your handset's internet connection to other mobile phones and PC-based services such as Skype®, Google Talk™, MSN® Messenger, SIP and Twitter, at no extra cost.


fring™ is a free mobile VoIP software that lets you talk and live chat (IM) using your handset's Internet connection instead of costly mobile airtime (GSM) minutes. fring enables free mobile calls over Wi-Fi Internet access or your GPRS, EDGE or 3G Internet data plan.

FRING.COM

Palringo Vocal IM

Vocal Instant Messaging

Key Features

* Voice: use your mobile to chat with friends by speaking or texting
* Messaging: leave messages even when contacts are not connected
* Availability: Instantly see status of contacts
* Interoperability: Connect to users of popular PC IM systems
* Open: Works independent of your mobile service provider

The application currently supports the Smartphone, Pocket PC, Windows XP and Windows Vista platforms.

Visit the Palringo site at palringo.com and sign up for the beta trial. Basic functionallity within the application is free, and will remain free.