Pirch

One of the most popular IRC clients of its time

Trillian

A multiplatform chat client

Free Email Extractor

Easily gather email addresses

Guitar Tuner

How to tune your guitar or any other string instrument

ICQ

Complete instant messaging client integrated with social networks

Microsoft Outlook

Microsoft's email client

Turbo Mailer

Send mass emails

Windows Live Mail

Microsoft's multi-account email client

Visual Chat

Create your own chat channel in 3D

Outlook Connector

Use your Hotmail accounts straight from Outlook

Yahoo Mail

Access to your Yahoo email account

Stellar Converter for OST

Convert your Outlook emails to PST format

Zimbra Desktop

Manage all your accounts from the same application

Mail Bomber

One of the best massive email delivery programs

mIRC

Chat on IRC with this great client

IncrediMail

Customize your email's appearance and give your friends a surprise

Model ChemLab

Simulate a chemistry lab on your PC

Biogenesis

Observe the evolutionary process of various organisms

EniG. Periodic Table of the Elements

Free periodic table of elements with many extra features

SnapGene Viewer

Observe DNA sequences

QPeriodicTable

Discover all the secrets of the chemical elements

Physion

2D virtual physics laboratory

ArgusLab

Application to view and develop molecules

ChemSketch

Tool to learn chemistry by drawing compound structures

PhET

Carry out dozens of scientific experiments from your PC

Physics 101 SE

Learn physics and calculate anything whenever you want

FluidSIM

Program to create exciting electro-pneumatic circuits

Curved Spaces

Represent interconnected universes on your PC

Algodoo

A fun way to learn physics

Serial Cloner

Molecular biology application