Talkonaut is mobile IM chat and mVoIP application.

It supports most popular networks, such as Jabber, GTalk, ICQ, MSN, AIM and Yahoo, for chatting and voice calling. Talkonaut enables free VoIP calls over GPRS/EDGE and over 3G or WIFI.

Features:

IM chat, Group chat (see presence and status)
Chat history
Avatars
Calling over GPRS, 3G or WIFI
Calling to GTalk, MSN, Yahoo, AIM and iChat
Traffic compression (ZLIB)
File sharing
SIP support
WIFI roaming

Avatars and chat history features can be disabled in Settings to reduce memory usage and traffic consumption.

Use Hear and Write to convert your speech into text and the paste it in any application. And you can send SMS by just saying the recipient and the text.
This software is based on Google voice recognition technology and web services.

Supports the following languages: English (UK and US), Italian, French, German, Spanish and Russian.

Applications requires Qt. (Download QT Here)

This application measures oxygen saturation changes in your blood.
On every heart beat your blood becomes more oxygen rich which causes a slight change in the color of your skin.
Camera in your mobile tracks that change and the Application calculates your heart rate.
It works in a similar way as a medical pulse oximeter but without a dedicated light source.
Place your left index finger gently over the camera lens. ‘Press’ button. Your current heart rate will be displayed in a few seconds.

Application requires installed Qt. (Download QT Here)